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Loki actually is Odin's son. He'd been shagging Loki's mother before the war started.
The mythology is pretty clear that the Aesir can't keep it in their pants, especially with jotnar. Explains why he's so tiny and why he changes color. Odin probably knows this, but didn't tell Loki because he's a lying *bleep*.

Loki's coloring is temperature sensitive.
All jotnar are blue only when super-cooled, otherwise they have humanlike coloring. Full-grown jotnar take a while to warm up, so they remained blue while wandering around Asgard. Likewise, full-grown Loki doesn't cool down very fast unless he's making direct contact with a source of extreme cold, such as the Jotunheim power source or an actual jotun. (Baby Loki, on the other hand, is very tiny and conducts heat pretty quickly.)

Loki will wind up wanting to come back to the light side, though it may be impossible
On the one hand, his motives are largely good: he wants to make his father proud and do his duty for Asgard. His real villainy only came after he went mad from the revalation that he was a Frost Giant, though he definitely also has Jealousy as a major character flaw. That may be enough reason for him to feel regret at how things turned out. On the other hand, he winds up trying to kill his brother and commit genocide against the jotnar, not to mention showing no regard for the human collateral damage the destroyer caused. Even if he felt regret about it, he might either decide he'd already gone too far to change or that noone would accept his Heel–Face Turn after everything he's done.
  • One has to debate upon his genocide against the jotnar, though because it is more than likely that he believed that if he managed to destroy what was currently a threat to Asgard, he would be doing his father proud.
  • I think that is an entirely credible interpretation of why he let go at the end of the movie.
  • Considering the after credits scene and the fact he's going to be the main villain in the Avengers, it's doubtful.
    • Considering his more sympathetic portrayal, he may turn out to be a bit more redeemable than his comic book counterpart though. (Especially since the fangirls are all over him now.)
    • Or he might decide that Red Skull/Hydra/whoever he's working with is too evil (Loki's mostly defined by wanting Thor dead/to prove himself better than Thor/to impress Odin in the movie; his whole "cause Raganarok" thing has never come up) and stop them, either for an "only I get to kill you" with Thor or because whatever the villains are doing threatens Asgard (and Loki has nothing against Asgard as much as Thor, unlike in the comics). He'll probably make a Heel–Face Turn and leave after it's all over before anyone can stop him, hinting that he'll get Thor "next time" and therefore laying the groundwork for his appearance in the sequel.
    • He may not even have to wait for Thor 2 — it's possible that Word of God about his villainhood in The Avengers is a misdirect, and that he's only The Dragon, and will have his Heel–Face Turn before the end of that movie.
      • According to another interview with Tom Hiddleston, while there will be spots of hope for Loki's redemption in The Avengers, he will not be redeemed. It is rather likely, however, that the bigger villain will turn up in Thor 2 and Loki will join with Thor in order to defeat this new threat.
  • Confirmed by Ragnarok and Infinity War.

The Scary Black Man that attacked Thor was Luke Cage
He seemed to have some amount of super strength, even if it is the Charles Atlas Superpower kind, and he WAS working along with Hawkeye which is an important character who will appear in the Avengers movie.Either this was a setup for Luke appearing in the Avengers movie, or they just wanted to reference the character even if he isn't going to be used.
  • Luke Cage has no connections to SHIELD and will not appear in Avengers. It was just a big guy that fought a powerless Thor.
    • Yea, there's no way that was Luke Cage, who would have crushed the Brought Down to Normal Thor.
    • Please that was obviously Brick Wall from Kickers Inc.
  • Jossed. He shows up in his Netflix show.

The Scary Black Man that attacked Thor was Heimdall
He was as big as Thor, he was there as a guardian, and the scene right after Thor tries to lift Mjolnir is Heimdall looking at it.

Thor Odinson is not the first Asgardian named Thor to wield Mjolnir
The era when Norse myth was first recorded, based on observations of the war between the Asgardians and the jotnar, predated the birth of Thor. So, why does Norse legend record an individual named Thor? Because there was a warrior named Thor who fought in that war. He just wasn't Thor Odinson, or at least not the Thor of the movie. He was instead a red haired warrior of Odin's generation, and most likely died during the war. Thor Odinson, the Thor we know, is named after the deceased hero of the Jotun war. Hence the differences in appearance between him and his legend.
  • Considering how Ragnarok and the constant life-death-rebirth cycle of Norse myth work, this may well be the case—Thor is named after the same god in previous cycles.
  • The reason the original, red-haired Thor is referred to in some sources as Odin's son is because the stories became corrupted over time, and Odin's contemporary Thor was accidentally conflated with Odin's young son Thor (assuming the Asgardians had not already left Earth by the time Thor Odinson was born). This, of course, would have only served to fuel Thor Odinson's already-immense ego.
  • By extension, the Loki in the film is not the first Asgardian to bear his name, either — which is why there's a Loki in Norse mythology, and why someone can be seen wearing Loki's distinctive helmet during the scene where Odin claims the jotnar's casket.
    • Or it might be a callback to the comic storyline where Loki timetravelled.
    • Or maybe, in the MCU only, of course, the helmet itself comes with some important role in Asgard, like the Captain of the Guard or Head Mage or something - makes sense to throw Loki a bone when Thor is being made King of Asgard. However, this theory, if taken to its logical conclusion, also makes his continued usage of the helmet in The Avengers either a Crowning Moment of Fridge Heartbreaking (as in, he can't bear to part with the only symbol of leadership they gave him in Asgard, regardless of how it is also a continual reminder of his perceived inferiority to Thor, and the idea that he is still Asgardian at heart and resolutely doesn't identify with the Jotun), or just really weird. (Or maybe this troper just needs to get some sleep.)
  • Alternate theory: We don’t know how much time passed between the end of the Asgard/Jutenheim war and the Asgardians ending casual contact with Earth. Since Norse Mythology attributes the god’s long life-spans to the golden apples of the Goddess Idun, rather that something biologically inherent, it could be that they mature at the same rate as humans, or something close to it. So there’s plenty of “launch window” for both Thor and Loki to have reached adulthood and been incorporated into Norse folklore well before the end of the Viking era
    • That makes a fair bit of sense, especially if we take 'The Apples of Idun' as a historic misinterpretation of whatever sufficiently advanced tech makes them immortal. In the mythology Thor didn't show up in the first war with Ymir and the other frost giants, his stories take place later. So a young and untried Thor is the character we see in the Norse Myths, dealing with the aftermath of the war.
  • Except the book about Norse myths we see in the movie clearly shows a blonde Thor, so even if there was a previous Thor he probably wouldn't be red-haired. Also Fandral has a line that implies that the Thor seen in the movie was the one worshiped on Earth.
  • According to Ragnarok, Hela wielded the Mjolnir before.

The Frost Giants are asexual
We know that Laufey had at least one son but we never even see any female giants.
  • Would you be able to tell a female jotun from a male? That said, I don't disagree. I could entirely see the jotnar reproducing asexually, maybe spinning off "eggs" of ice that "hatch" into their young.
  • Going by the original mythology, while there were female jotnar, Ymir (the original Frost Giant) produced numerous offspring by himself, so there may be something to this...
    • Also, in the original mythology Laufey was Loki's mother. So either he/she got a Gender Bender in this cycle of gods and associated beings, or Laufey's a Truly Single Parent.
      • Laufey's been a male in the comics since the 60's while Farbauti has been a female, since this is based off the comics they kept the change.
      • Then, if we take comics/movies as the "truth" and the myths as stories told by Norsemen who simply met Asgardians and jotnar, perhaps for whatever reason they simply ended up conflating Loki's parents into one being.
  • Could be that Frost Giants just don't have much sexual dimorphism, and prefer to refer to one another as male (ala dwarves in Discworld). In which case, Laufey is still Loki's mother.
  • Laufey and Odin are Loki's parents. After a brief but tumultuous affair, Odin won custody. Laufey's visiting rights are a sore point.
  • In the mythology Ymir, who was the first frost giant(also the first living being in the universe) just kind of came out of the ice. maybe this kind of thing happens often on Jotunheim.
  • Also in the mythology, Loki is most definately not asexual. He's the mother of Slepnir, for one. (Yeah, really.)
    • Asexual reproduction (and one gendered species which may require asexual reproduction) is different than asexuality, as in not being sexually attracted to anyone (or anything). In theory the Jotnar could only have one of gender and reproduce asexually but still be sexually attracted to either each other or other species. Also it's not yet canon in the movie that Slepnir is Loki's child. The comics vary a lot from Norse Mythology.
  • It could be that the jotnar are an inherently magical race (preferring ice magic, obviously), and are thus ALL capable of shapeshifting (hence why baby Loki was able to transform into an Asgardian - it's a subconscious defense mechanism, an attempt to integrate into a species for safety). Laufey could have transformed into a female if he so desired, and mated with a male-formed Jotun (possibly Farbauti). So, technically, he WOULD be Loki's mother.

The Asgardians are the descendents of an earlier generation of super humans, who departed Earth
Think about it: the Asgardians entirely look human. They bear a connection to Earth, hence the defending of it from the jotnar. And when stripped of their powers, the result is. . . a normal human. And we know humans are capable of developing preternatural abilities in the setting. So, theory: thousands of years back, there was an 'Age of Heroes' where superhumans evolved. They probably did their thing, grew powerful, bred a lot, developed understandings of their powers, and probably built great civilizations. For whatever reason, some or all of them decided to leave collectively, and create a new home ( or homes? ) elsewhere in the universe.
  • Since it's suggested that The Realms are defined as the nine planets connected by a natural wormhole network (see below), and the myths point to a common origin for the Asgardians and Frost Giants, this makes a good amount of sense.
  • So they're the Eternals?

Part of the reason behind the casting of Heimdall was to keep away racists
There are Neo Nazi morons and suchlike that tend to like the Norse gods or worship some twisted version of them. Studio execs were worried that these bastards might cling onto the film like a lamprey sucking away at the bottom line. Though i am not going to say this was the only reason why he was cast (he was pretty *bleep* awesome in the part), but I could imagine some studio execs and marketing guys looking over the list of people who want to play the role and did well and said "of these three final guys, lets go with the black guy because he is going to keep those racist morons away".
  • The original Norse legends refer to Heimdall as "the whitest of all the gods." I can't imagine that casting Idris Elba was entirely an accident.
  • The fact that the casting choice inspired real-life white supremacist groups to protest the movie probably helped the movie a little bit - No Such Thing as Bad Publicity, with the bad publicity drummed up by the lease agreeable source possible. It probably also helped quell many comic fans' complaints about the movie's color blind casting.

Odin and Nick Fury are somehow related
Bear with me here: Certain sources in Norse mythology put Heimdall as Odin's son, yes? But Odin's white and Heimdall's black in the movie. On the other hand, Odin and Nick Fury are both one-eyed authority figures, and Fury is black. Going back to Norse myth here, Odin knows all the runes and all the secrets of magic. Maybe he's behind more than we know using various alternate forms?

Just like in the comics and mythology, Thor in the movies is indeed in love with and and probably engaged to Sif
Its just that, when you're immortal, spending a human lifetime with somebody else is roughly the equivalent of flirting with somebody for a few minutes.
  • Jossed

Stan the Man only tried lifting the hammer with his car, not with his hands
If he'd tried it with his hands, he'd have been able to lift it easily. Unfortunately, his pickup truck wasn't as worthy as he was.

Sif is also a frost giant.
Doesn't she look enough like Loki to be related?

The portal between Earth and Asgard already exists.
Remember those auroras that Jane is hunting at the beginning of the movie? The ones that we're told appear at a completely predictable interval? That's the portal. At the end of the film, Jane and co. aren't inventing a portal, they're calculating when the next portal opens; that's why they're in such a rush, it's about to open soon and they want to be there. And notice that bright glow that covers Thor's face at the very end...
  • Lets not forget, Loki outright said that there are three secret passageways between the Realms that are beyond Heimdall's sight. He can't be the only one capable of finding them, can he?
  • I like this idea, especially as it explains why nine different planets scattered through the universe are all counted as 'The Realms' despite having little in common. Maybe they're all connected by a natural wormhole network.
    • Most likely Yggdrasil.

The Asgardians are descendants of a different sort of Gallifreyan
Another subset of people, who, like the Time Lords developed a different sort of mega powerful technology except it traverses space instead of time.1. It would be awesome2. Time Lords are stronger than humans, Asgardians infinitely more so.3. No one else has said it yet.

Loki journeyed to Midgard before
When he met Thor in the S.H.I.E.L.D. compound, he was dressed like a human and seemed very comfortable with human technology. Going to Midgard after falling to the broken Bifrost was a contingency plan based on his previous experiences with Midgard and its people.

Thor will get back to Midgard using the same path Loki did.
Because they clearly state Thor is going to be in The Avengers, and Loki used a secret passageway that wasn't Bifrost.
  • Jossed, Odin sends him there via "dark energy".

"Whitest God" is still used to refer to the setting's Heimdall, but as an ironic nickname.
Sort of like calling a big guy "Tiny".

Heimdall is still the whitest of all the gods.
He jumps worse than Volstagg. And when he dances ... it's very, very sad.

Lockjaw exists in this continuity
So when Thor asks for a dog big enough to ride, he gets one!
  • Thanks to ‘‘Inhumans’’, Lockjaw is now part of the MCU.

Andalasia is another one of the worlds on Yggdrasil.
Notice how similar the interdimensional space Thor passes through is to what Giselle passes through during her own banishment on Midgard.

Gallifrey and Skaro are other worlds on Yggdrasil.
Both Gallifrey and Asgard are home to superhuman beings that have a history of helping humans (although only one Gallifryan really has a human-helping history). Both have technology/magic capable of traveling through space (although Time Lords can also travel through time). Also, the enmity between the Time Lords and the Daleks is similar to the enmity between the Asgardians and the Frost Giants. And it would just be kind of awesome.

The Asgardians will learn there are millions of inhabited dimensions, and Yggdrasil leads to only nine of them.
Courtesy of Uatu. Or maybe Dr. Strange.
  • Confirmed, as Loki reveals other worlds and as of the sequel Asgard may be interacting with them.

Loki's final, definite Face–Heel Turn could have been prevented had Odin just said something more constructive than "No, Loki."
Not to excuse Loki's actions there, but he's one of the best-executed cases of Cry for the Devil in recent memory, and in this verse he's clearly in many ways still a really pathetic, attention-seeking boy. Imagine if Odin had just sighed "Loki, please don't do this. You are my son, and I could not bear to lose you." It seems pretty IC that this version of Loki might have allowed that, and then probably collapsed into angry, frustrated, needy tears. He'd probably still need a long, long time under the care of whatever the Asgardian equivalent of a psychiatrist is (not unlike Princess Azula's final fate), but at the very least he wouldn't've ended up going to rampage on Midgard for *bleep* and giggles.
  • This Troper (the one who speculated about Laufey below) is now writing an AU fanfic based on this guess.
  • Post-credits Odin is likely thinking just this. We all know Loki is a 'full tilt diva' so this can't be the first time he's done something outlandish for attention. The Warriors Three note that he's always been up to 'harmless mischief'. He's the class clown of Asgard. Odin's probably said 'No, Loki' many times when Loki was a kid. That's how he wanted to treat this incident; one more attention grabbing stunt by his son. It wouldn't be the first time he wanted to sweep trouble under the rug: "These are the actions of a boy, treat them as such." A gentle chid, likely something more serious once they were safely off the bridge, and life goes on as normal. This also isn't the first time he was blind to how deep his son's flaws went; It never crossed his mind that Loki would committ suicide.

The reason pre-revelation Loki let in a frost giant to “ruin [his] brother’s big day” was because then they could fight it off together and nothing would change between them.
It's very, very likely Loki wasn’t actually in villain territory until he knew what he was and it pushed him over the edge, and that his affection and happiness for his brother in the deleted scenes is completely genuine, if a little bittersweet. So even if he clearly has some resentment of Thor from the very start, enough to want to botch up the coronation, well, think about that for a moment. It would just delay the inevitable a bit, not make their father automatically think “Oh, clearly the throne should go to Loki instead.”

It’d keep them both as princes, with Loki and Thor on an even footing with each other. That could be the way Loki wanted it, where even if Thor’s Odin’s favorite, Thor doesn’t see himself as too powerful (or more innocently, too busy) to keep adventuring and stuff with his brother by his side as an equal and a foil. He might not even view it as callously as “to ruin my brother’s big day” at that point- post-revelation Loki is no longer rational or sane, and his much-increased jealousy of his brother after that might cause him to retroactively refer to his earlier actions much more bluntly and darkly.

  • Regarding that decision, it could also be one of Loki's ideas that he believed would be in the good of Asgard. He could see that Thor wasn't fit to take the throne and that him being crowned king would not be in the good of Asgard, so he may have set up the "prank" to show his father that Thor was not ready. All he needed was for Thor to attempt to go to Jotunheim to show Odin the truth, but things just spiralled out of hand.

Ragnarok has already happened once in the MCU
OK, so the old universe is dead, the new one is born, Cosmic Entity(s) like Galactus, Eternity & Oblivion pop up, and eventually, in one sector of space, Ymir and his cow emerge, then Buri, progenitor of the Aesirs, rises, formation of nine worlds, all that inbetween time, and eventually Ragnarök, from Balder's death, to Loki's torture and escape, to the Winter, to Order and Chaos fighting, to Surtur burning everything, everything happens exactly how the myths portray. But, somehow it's history was not lost, as the Cycle pops up once more. However, things change, whether it be small like Thor and Sif's hair color changing, Heimdall no longer being white, Hogun is now an Aesir to major like Slepnir (and maybe his trio of kids from Angerboda) no longer being sired by Loki, Yggdrasil changes from a tree to a constellation, maybe Balder and Tyr no longer existing, things like that.

So, the old myths get passed down to Earth/Midgard, but since events like Loki, since the Giants no longer look human, looks like an Aesir, and no longer has monster children like Fenrir or Jormungand, are somewhat skeptically believed even by Aesirs, explaining why he wasn't chased off so much earlier and how some things still look the same but are also so drastically different at times.

  • Jossed by Thor: Ragnarok.

Really, it was hard not to think "omg it's a GSV!" the first time Asgard showed up on screen.

The Destroyer will become the basis for Ultron.
SHIELD must have scavenged the parts, and Erik's connection to Hank Pym could bring that man into some work for SHIELD. Pym could start working on Ultron through the use of those parts and inadvertantly create a villain even more poerful than the robot was.
  • Or possibly, given that Hank Pym doesn't seem to be a thing in this 'verse, Tony Stark will do this.
  • It's been announced that an Ant-Man movie is on its way, which would bring this WMG back to life.
  • Jossed

The reason the American Southwest is desert is because the Bifrost ends there
It's a little destructive when it opens up, so it only makes sense. Maybe Arizona's Meteor Crater was from a particularly forceful transport.

The Serpent in Fear Itself was either Vili or Ve
Vili and Ve were the brothers of Odin, who helped Odin create the universe from Ymir's body in Norse Mythology. In the Marvel Universe, one of them took on the name "The Serpent", and was prophecized to kill Thor.
  • Nope. In the final issue, Odin calls him Cul.

The Asgard don't understand their own technology
This is why they can't easily rebuild the Bifrost bridge or equip everyone with a mass-produced Thor's Hammer, and why they refer to their tech as "magic". Their tech is actually made by another alien race, probably the ones corresponding to the dwarves in Norse myth (who made most of the Norse god's weapons and artefacts). Unfortunately the dwarves live elsewhere in the 9 Worlds and getting to them without the Bifrost is not easy.

Mjolnir is made of neutron star matter.
Odin says that it was "forged in the heart of a dying star", and it's too heavy to lift unless you're specifically able to lift it. Whoever made it also added compensation so that things don't get pulled in by it's gravity, and it didn't split Earth in half when it landed. It still hits as if it had its full weight.
  • He said "forged in a dying star," not "forged from a dying star." If Thor's hammer was neutronium, it would weigh twenty-nine-million tons. If Thor was strong enough to swing a twenty-nine-million ton hammer like an aluminum baseball bat, he wouldn't need to. He could kill Hulk with a missed punch.

The Enchantress from the comics is the same enchantress from Beauty and the Beast.
What with Disney having bought Marvel and all. Think about it: they both have long blonde hair, they both wear green, they're both described as being incredible beautiful, and they both do not react well to rejection. I can't unsee it!

Yggdrasil being the entire universe, Nidhogg, the dragon at its roots slowly devouring it, is the Asgardian name for...
Galactus. This won't be revealed until much farther down the road when the fans and mainstream viewers manage to have the bad taste of Death Cloud Galactus washed from their mouths.
  • It would need Marvel Studios to buy back the movie rights for the Fantastic Four franchise before it happens, since Galactus is considered a Fantastic Four villain. But that's not necessarily impossible.

Laufey is not a complete *bleep*.
No, hear me out. This guess is based on some of his dialogue from the film. Laufey was not a nice customer to be sure, no denying that. Willing to assassinate his helpless opponent, proud, vindictive, etcetera. But cold, iron-fisted tyrant of a fierce and angry people he might have been, it's possible he COULD have genuinely loved his son, Loki.

When Thor, Loki, Sif, and the Warriors Three invade Jotunheim, he viciously snaps out with, "Your father [Odin] is a murderer and a thief!" Thief obviously refers to the casket. Murderer though seems an oddly specific word for describing a warrior. Warriors kill in battle, while murder holds particularly bad, foul connotations. It's a very personal word. So Laufey feels that Odin killed someone who was especially close to him.

Could it be that Laufey thinks that upon entering the deserted temple after the battle, Odin killed the baby Loki and disposed of the body? We only have Odin's word and perspective that Loki was actively abandoned, anything could have happened in the confusion of battle to leave the young heir alone. And besides. A temple? Why the Hell would you abandon a baby you didn't care about in a holy place? That just doesn't make sense. Hell, guards who may have been assigned to protect Loki may have been slaughtered earlier outside, rushing in headfirst to try and defend their charge for all we know.

Laufey is an experienced warlord, at least as much as Odin. He's obviously experienced in the ways of war. A warlord has to be able to accept losses and casualties, and a bloodthirsty one like Laufey even more so. It would take a kind of special loss to make Laufey willing to engage in a truce, even for a while. The death of your first son, perhaps. Hence his line: "You know not what your actions would unleash. (Beat) ...I do."

Perhaps this is an overly elaborate Cry for the Devil, but I dig me some character speculation.

  • I'll bite. Laufey came off as pretty reasonable to me. Evil, but reasonable, pragmatic, and wanting to do what's best for the jotnar.
  • Some added weight to this theory comes courtesy of What If's seventh episode "What If... Thor Were an Only Child?" where Odin returns Loki to his people instead of adopting him. Laufey is happy to be reunited with his child and raises him as prince of Jotunheim, which wouldn't be the case if he had deliberately abandoned Loki.

Gods of the Marvel Universe remember stories better than events.
An old Thor comic shows that there was originally different Asgard, closer to one in mythology (with Red-haired Thor and all). This Asgard was destroyed during Ragnarok in the first century, and then surviving gods (Balder was one of them) merged into a new Odin and created a new Asgard, the one we know. But later comics often show events happening before that featuring current version of characters. That's because the characters heard stories and integrated them into their memories. That also explains why there are different versions of some events (like Odin adopting Loki): Every time a god hears a new story featuring himself, or a new version of an existing story, he/she unknowingly integrates that story into his/her memory and forgets every story that contradicts it. This extends to other gods in the Marvel Universe, as proven by the fact that Hercules remembers doing all 12 of his labours, whaen 2 of them were done by Gilgamesh.
  • Then they should have seen the dark haired bastard betrayer coming, because that's quite an old one. Wrong Genre Savvy?
    • Just because they remember stories doesn't mean they'll change them. You can't just change a good story.

Movie-Balder has died and has been reborn as a human.
Balder was absent from the movie and it was noticable. We know that the movie combined elements from Earth-616 and Ultimate Universe. We also know that Donald Blake and Thor are two separate characters. So, my theory goes like this: Some time in the past, Balder was killed by Hoder. If Loki was involved, he managed to escape the blame. Then, Balder was reborn as a human: Donald Blake (like in the Ultimate Universe). The reason his relationship with Jane failed is the fact that, at that time, he was starting to remember who he really was.

Odin has been sending saboteurs to Jotunheim to keep them blasted back to the Stone Age.
It's a little suspicious that nearly 1050 years after the big war with the jotnar, they're still living in ruins. Even if they couldn't pull themselves back to where they were before Odin took the Casket of Ancient Winters, you'd think that after all that time, they could have gotten something up and going again.

Selvig was Loki's servant the whole time.
He kept an eye on Thor while pretending to not believe his story for the benefit of the other mortals. And he wasn't mind controlled in the stinger at the end - he was just following his master's telepathic orders, unaware of the genocidal circumstances that led to Loki being stranded across space. Loki mind controls him in Avengers because he knows Selvig is a moral person and Thor's friend and will defect to Thor's side as soon as he sees how batcrap crazy and murderous Loki has gone.

Heimdall's sword is made of Vibranium.
Heimdall activates the Bifrost by plunging his sword into the main engine, so clearly his sword is the key. Now, in Captain America: The First Avenger, Cap and the Red Skull accidentally created a Bifrost effect when Cap's shield hits the Valkrie's power source containing the Tesseract, carrying away the Red Skull. Cap's shield is made out of Vibranium, so it was the "key". Therefore, Heimdall's sword is made of Vibranium. Might the heroes ever figure this out to create their own Bifrost?

Time passes more slowly in Asgard than it does on Earth.
A short period of time in Asgard is a much longer period of time on Earth. This would explain why Thor's understanding of Earth customs is so out of date. It would also explain why he'd never see Jane again if he destroyed the Bifrost. The Asgardians could rebuild it but it would take so long that Jane would be old or dead by the time they finished.
  • Yes, I agree with this troper: the movie established that the nine worlds of Yggdrasil were all connected, possibly by wormholes. Theoretically, these nine worlds, then, could be in their own parallel dimensions. Time could pass on different scales between these dimensions, allowing Loki (our age scale, since we know he was a baby when it was 903AD on Earth) to be in his late 20’s/early 30’s on Asgard when it is around 2010 on Earth, without actually living for more than a thousand years. This would allow an Asgardian living on Earth to age as Earth-dwellers do, but an Earth individual on Asgard could live thirty or so years there, return to Earth, and find that more than a thousand years have passed. This could make for interesting developments when Jane returns to Earth after her adventures across the dimensions in The Dark World. But then how was Thor able to be banished and then rescued from Earth in the space of a few Earth days, an Earth week at most? Maybe Loki’s reign only lasted a few Asgardian hours. This theory explains the 'living for endless time' part of immortality, but it doesn’t explain the 'gods are indestructible' theory, that is, why Asgardian/Frost Giant individuals are capable of withstanding forces (e.g. being slammed into the side of a mountain, falling from insane heights, wrestling with the Hulk, being smooshed into a marble floor, etc.) Earth individuals couldn’t really stand up to.

Young Loki and Mjolnir
When at the begining and Thor and Loki are just young teenagers, Mjolnir is visible. Now, if people who know the mythology can tell you, Thor was given the hammer by some Dwarfs after Loki tricked them. Their retaliation for Loki tricking them was to stitch his mouth close. The reason Loki was all quiet all the time was that, as a child, he had his mouth stitched closed by some Dwarfs. That would, understandably, be very unnerving to a young child and leave them very quiet and withdrawn. Loki's entire confidence issue that lead to his slip into evilness was because of this event, and his resentment of Thor was fueled by Thor getting a hammer out of the deal while he was severly traumatized.
  • There's also the fact that in the battle at the beginning (during which baby Loki was found), Odin is riding Sleipnir, who is Loki's son. Ummmm...
  • Jossed. According to Ragnarok, Mjolnir was around before Thor and Loki were born

Thor as king
On the subject of Loki, why would Odin pick Thor as King? He was shown to be rash, was very agressive, and was still mentally a teenager. The only other candidate was Loki, since he was the only other son we saw. Except, two possibly reasons: Odin lost his eye, which was suposed to be when he gained a chunk of knowledge about future events, including Loki starting Ragnorok. He took in Loki just after loosing his eye, which was to bring peace to Asgard as he believed that by raising him as his own, he could avoid Ragnarok. However, he couldn't risk him becoming ruler of Asgard just in case he failed to raise him right. Alternativly, there's the reason why Loki would cause Ragnarok: Loki was to accidentally cause the Death of Baldur, one of Odin's sons, and would later insult them when they talked about him behind his back. They'd retaliate by binding him with a snake dripping venom into his eyes, which drove him insane and lead to him starting Ragnorok. In the film, Loki had recently caused the death of Baldur, and Odin didn't think he was ready to be king because of this. Which would then lead to the events of the film, which lead to Loki getting too out of hand from his growing hatred, resulting in Odin eventually having him binded, leading to Ragnarok. We're just in the stages in between Baldur's death and Loki's binding.

Loki is Yandere for Thor
YMMV on whether it's romantically or platonically, but during the fight beneath Yygdrasil, Loki starts berating Thor for his new softness regarding the jötnar and blames it on Jane. Loki's obviously not happy with this new development and if you watch closely, when he's talking about Jane, there's a tear running down his cheek before he starts taunting Thor and threatening to kill Jane in a tone that sounds very much like the Murder the Hypotenuse and If I Can't Have You… methods yanderes tend to favor. All Loki ever wanted to be was to be on equal footing with Thor and when (in his mind) Jane took that away from him and changed Thor, Loki immediately decided she had to go.

Hogun is Genghis Khan
Because his actor played Genghis Khan (very well, I might add) in Mongol. And by Khorne, wouldn't Genghis Khan in Valhalla be awesome?
  • Hogun actually looks a bit more Mongol in the comics (oddly, since he was based on Charles Bronson) but apparently Jossed by him being a Vanir.
    • Technically it's not impossible that he lives among the Vanir but is originally an Earthly warrior who ascended to Valhalla as described by Norse mythology.

and Loki will share a scene with each other when they are saving the world. Expect lots of dancing around the fact that Loki stabbed Coulson and Coulson is somehow still alive followed by the two only working together because their skill sets are what art needed for something. And then Coulson falling apart once Loki leaves.
  • Jossed. They never meet again before Loki's death in Infinity War.

Loki will turn into a woman.
  • Jossed. He dies in Infinity War.

Darcy is a stoner.
Think about it; the wardrobe, the deadpan voice, how completely unphased she is by Thor. Oh yeah, she gets high.

The Asgardians are Sufficiently Advanced Aliens that just forgot everything they have is based on science
Some unimaginable long time ago, the Asgards had ran out of physical laws to break. Nothing more could be discovered, nothing more could be invented. So, the society became like gods, acted like gods. The problem was, the memories telling how to create the technology slowly dimmed, till as far as the Asgards were concerned they ARE gods. The technology is so advanced, it does not need to be maintained, but can't be easily rebuilt.

If Phil Coulson had actually tried to lift Thor's hammer himself, he would have been able to.
All the ballyhoo that SHIELD creates around the hammer due to not being able to move it could easily have been avoided, had Phil Coulson simply just walked over and tried. He would have been worthy. Because even Odin thinks he's awesome.

The Bifrost is a prototype Mass Relay
It covers vast distances in seconds and works both ways, but there's still the problem of leaving it open, as Loki so kindly demonstrated on Jotunheim.

Tom Hiddleston is really Loki
Here are two reasonings.

1) Loki is very easy going with the human technology, almost as if he's been around it for a long time. He came up with Tom's identity on one of his trips to Midgard when questioned by someone and he decided to keep that name, eventually starting an acting career, both to keep up appearances, but also to practice his trickster powers. Taking into account the Narnia Time theory above, so no one on Asgard would notice his long absences, and when he leaves Midgard, "Tom" will just be on vacation somewhere.

2) Tom was a real person who was killed and Loki took his persona as a disguise, discovering the power of fangirls when they would want to get his autograph and hug him wherever he went. Soon, he will have an army so massive, no military on Midgard or Asgard can stop him.

In the Marvel Cinematic Universe, Hel is a necromancer rather than the goddess of the dead.
Her ability to revive and control the dead caused humans to mistake her for the goddess of death.
  • Jossed. Hela appears in Ragnarok.

Asgard isn't actually located in the same plane of existence as the other realms.
Hence why they need the Bifrost and/or secret paths to get anywhere. I imagine it as being located at the centre of the universe, and the centre of time itself. This could explain how there are stories about Asgardians on Earth despite the person in question not having been old enough/alive at the time. The secret paths could be more unreliable i.e. you might show up a few hundred years late, and since the Bifrost was "harnessed" they've been abandoned.

Odin is not worthy to wield Mjolnir.
The only time we see him hold Mjolnir, it's before he puts the enchantment on it.
  • It explains why Odin doesn't put a similar enchantment on Gungnir (his spear). Perhaps as a king, he's had to do some morally ambiguous things to protect his kingdom.
  • But then how does Odin summon Mjolnir to his hand? And how is he able to throw it into the wormhole after putting the enchantment on it?
    • Because before then there was no requirement to wield it. This could still be conceivably true, if Odin has done so much I Did What I Had to Do that he's not worthy of being called a hero.

The Nine Worlds
We're already pretty familiar with Asgard, Midgard and Jotunheim. That's three. The sequel introduces Svartalfheim and Vanaheim, so that's five. Now on to speculation:
  • Thor has mentioned Alfheim, let's call that six.
  • Thor has mentioned Nornheim, which isn't in the source material but the (admittedly non-canon) video game suggests it's the home of the Rock Trolls and a separate realm unto itself. That's seven.
  • Let's take a leap and say Helheim and Muspelheim are the last two. This leaves out the traditional Niflheim (but let's face it, Jotunheim's got that covered- maybe they're the same?) and Nidavellir (again, maybe part of a larger realm?)
    • Jossed, including the initial five mentioned and Alfheim, the remainders are Muspelheim, Niflheim, and Nidavellir.

Thor's comment about Sif being a warrior isn't as sexist as you think.
It's not about Asgard having no female warriors (the old Norse women were quite capable, and evidence suggests they would go into battle alongside men fairly often). Rather, it's about Sif become so awesome of a warrior that she's part of Thor's elite hit squad. Asgardian women can certainly kick ass (witness Frigga in Thor: The Dark World), but any warrior who wants to join Thor's merry band has to be the absolute top-shelf of badassery. Asgardians scoffed at Sif for wanting to be that caliber of warrior, not just for wanting to be a warrior in general. As they might scoff at any male who said "I'm going to join Thor and Warriors Two when I grow up!" by saying "Well, you'll have to be able to take on a dozen Einherjar signle-handed, boy."

Heimdall isn't a native Asgardian.
Like Hogun, he comes from another world and simply has been living in Asgard for centuries. Certainly explains why he seems to be the only black person there.
  • Very likely jossed; besides, there are quite a few black Asgardian background characters in all three Thor movies, even before the introduction of Valkyrie.

Asgardians do speak Old Norse
When Thor first wakes up on Earth, the first words he says around the humans who find him are "Hammer! Hammer!" Since the word is the same in Old Norse — and might have come from Asgard — that just might mean that he's actually speaking his native tongue, up until he notices the English-speakers around him. And that all the other gods and giants had been speaking it all this time too.

Valkyrie and Jane Foster will be a couple
In the upcoming Thor: Love and Thunder movie, Valkyrie is looking for a queen, right? Maybe she will hook up with Jane Foster. Perhaps the reason Jane broke up with Thor is because she is more attracted to women, and wants to pursue a female life partner.