The Rashomon: The Eds trying to explain to Jonny how they wound up trapped inside his wall. Eddy's version has him rich and successful, while the other kids are crude caricatures (except for Nazz). Double D's version is in a pristine world where his crazy friends always screw things up and he has to lecture them. Ed's is just... bizarre to say the least.
The funniest thing about it was Ed's was the most realistic... aside from the Kankers anyway, because everyone looked closer to their personalities. There was no abnormality of anyone's personalities, most especially Jimmy. Eddy made him a diaper boy with crude utensils around his mouth, Edd imagined him without his brace, and Ed saw him as the legit limp and dramatic boy he is. "Farewell cruel world!"
Except dream Kevin used the word "dork" in a sentence not about the Eds ("I'm dorkin', man!"), and Nazz just did a disturbed laugh, even while she was running away.
Re Traux: One part of the hide and seek episode had Ed hiding inside a tv, where he winds up in a 1920's silent cartoon-Ed himself is even drawn to look like an old cartoon character in that brief scene. This even gets a "blink and you'll miss it" shout out in the movie.
Possibly even topped in the flashback episode where Ed, Edd n Eddy end up as kids. Edd refuses to participate in the scam, so Ed goes off-screen and slams a freaking house on Edd.
Ed: Lots of hurt, hold the onions!
Ed does the same thing to Eddy in an earlier episode.
Schizo Tech: The show is set in an ambiguous timeline. Sometimes it appears to be set in the 70s, sometimes the 90s and sometimes the 21st century.
According to a store in the prepare for school episode, it is most likely set in the 2000s.
In the beginning of the movie, Double D uses a commemorative glass in Eddy's brother's room to listen through the door. The glass has "Peach Creek Diner 2000 Best Eater" on it, thus adding more confusion to the exact date of the series.
Screen Shake: Played for Laughs as this often occurs when a character falls down. One notable instance is when Ed and Eddy fight over a balloon while Jonny watches as he eats some peanuts in "Ed, Edd, and Away".
At the end of "Who Let The Ed In?", Eddy hits Ed with an invisible potato in an invisible slingshot.
This trope also occurs in the Valentine's Day special when Kevin tosses the end of the gym rope towards Eddy, and it hits him in the face.
In "The Good, The Bad, and the Ed", Rolf challenges Eddy to a series of dangerous challenges. One of the challenges involved Eddy and Rolf getting giant boulders smashed against themselves in a giant Newton's Cradle. At the start of that challenge, Eddy's POV shows Ed tossing one of the boulders, smashing him hard.
Edd (sensitive) and Kevin (manly) - a popular couple in fandom.
Series Continuity Error: While this show in general was very good with continuity, the first season struggled with it (benefit of the doubt could be justified since the show as just starting); a few specific examples are as follows:
Double D is actually refered to as "Edd" on some occasions by Eddy (Ed once called him "Edd-Double-D").
Double D also had a crush on Sarah while she shows no interest in him at all, which of course is completely reversed later that season.
Although each of the Kanker Sisters already had designs on their respective Ed counterpart, in their debut episode, they don't seem to care which Ed in particular they impress, they each seem to like all three of them equally.
Also, Lee and May seem to go back and forth between being the unofficial leader of the trio.
All of the cul-de-sac kids, particularly in the very early episodes, seem to hold comtempt for the Eds, even without Kevin's influence (Jonny is the only exception).
Stock Audio Clip: A few short lines are stock audio phrases reused throughout the series.
Ed: Gravy! Rolf: You crazy!, laughing Nazz: This is stupid. Kevin: Dorks! Jimmy: And it was such a cute squirrel, too. Ouch! Wah-ha-ha-haaaa (that whiny crying he does from time to time, such as getting hoodwinked by Eddy with "Smilyland" or after getting maimed by his own eyelash curler).
Eddy frequently makes a distinctive grunting sound whenever he's annoyed or surprised.
Stock Sound Effects: Ohhh boy, this show LOVES using these, and always at the most inappropriate times.
Eddy: Johnny! People really like it when you SAY WHY ALL THE TIME!!
Superstition Episode: An episode features Eddy being plagued by a cursed telephone. The worst part of it is, the bad luck is afflicted on him even if someone else answers it.
Super Strength: Ed, Rolf, and Sarah have all been shown to be stronger than your average human. Rolf's backbreaking chores give him an excuse, at least.
In the first episode, "The Ed-Touchables", Eddy also shows at least a temporary bout of Super Strength by lifting, and slamming down, Edd's bed in an attempt to stop him from panicking (an attempt which worked incidentally, though it did leave the bed damaged beyond repair).
Eddy actually seems to have super strength similar to the above mentioned three, since several times it seems Ed actually fears Eddy harming him, he's fought evenly and bested Sarah several times throughout it the series, and he even can take just slightly less physical punishment than Rolf. It's likely that his fear of his brother causes him to immediately cave when someone tries to hurt him rather than fight back so his strength becomes less obvious.
Swallowed a Fly: In one episode, Eddy unintentionally swallows a fly and loses his voice because of it.
Take Our Word for It: It is never revealed what Edd keeps under his hat, but it is certain that he has reason to do so from the times when his hat is taken off.
If you played the food fight game as Double D on the official website he'd throw his hat up in victory, revealing that his hairdo has a disturbing resemblance to Ed's (In other words he's practically bald with only a bit of stubble here and there for hair)
^Yes, but that game was not made/directed by AKA and thus is not canon.
Terrible Trio: If the Eds have gone too far in a scam, the kids will jump to that conclusion immediately. The Kanker Sisters are a more proper example, especially when they destroy the cul-de-sac trying to find their heirloom, the Ship-Inna-Bottle.
Tomboy and Girly Girl: Sarah (Tomboy) and Nazz (Girly Girl). Sarah is one of the most powerful female characters, possessing superhuman strength like her brother, and is able to beat up almost every other character (usually the Eds). She is also reckless with a short temper. Nazz, however is gentle and caring, but is seldom seen getting in physical altercations with the other characters. Although there are moments that prove that Nazz can hold her own in a fight, she is usually interested in cheerleading, cooking, cute boys, and makeup.
However, in groups, it's The Kankers (Tomboys) to Sarah and Nazz (Girly Girls).
Toon Physics: Drive the entire show, especially lampshaded in "1 + 1 = Ed".
Trademark Favorite Food: Jawbreakers for everyone—they act as a sort of currency and/or prize. Ed, meanwhile, loves buttered toast and gravy.
And in the episode 'Brother, Can You Spare an Ed?', Sarah and Jimmy wanted Ed to buy them fudge instead of jawbreakers. So either that's their favorite food or the writers just gave them a craving for fudge for the sake of the episode.
Traumatic Haircut: Nazz in the movie, due to separation from hair care products. Played for laughs.
Turtle Power: "Ed, do you know there's a turtle on your head?" "Yep."
The Unreveal: Applied to the secret of what lies beneath Double D's hat, TWICE.
In The Movie. Just what DID the Eds do that A) resulted in Jonny getting a bear trap on his head, Kevin getting set on fire, Nazz wearing a box and losing most of her hair, and Rolf getting a chunk bitten out of his torso; and B) that Eddy thought going to his abusive big brother was the better option over letting the other kids get back at him?
In another episode, Eddy is running for King of the Cul-de-Sac against Plank and resorts to Blackmail. We never see what the photograph is, but it horrifies everyone who sees it (except Rolf, who doesn't understand it at all).
Un-Cancelled: The episode Take This Ed and Shove It was originally meant to be the series finale, but due to fan demand the series was brought back for a final season. Recent new from the creator of the show, Danny Antonucci, has hinted at it being uncanceled yet again.
Unrequited Love Switcheroo: In the Ed-Touchables, the first episode, it would appear that Double-D has the crush on Sarah and she's just not interested. Five episodes later, this is reversed and intensified, with Sarah developing an obsession with Double-D who is scared that she won't leave him alone.
59 episodes later with "Tight End Ed", Double-D blushes heavily when Ed puts Sarah on his back, though this may be out of awkwardness due to Sarah's crush.
Unstoppable Rage: "Little Blue Ed" shows us that almost nothing in the world can stop Ed when he's in a bad mood... all because he ended up with a pebble in his shoe.
Vague Age: Averted with the main trio (they're all 12), but played straight with all the other characters (All of them are junior high age, apparently).
Based on the episodes that the Eds are in school, Nazz and Kevin at least are the same age as them since they're in the same classes with them. The Kankers and Rolf may be the same age or they might be older and have been held back for some reason (likely bad grades or failing to have the some other requirements to go to the next grade).
Visual Pun: While Edd is giving a morality lecture, Eddy simply reaches down, picks a sock up, and shoves it in Edd's mouth. There are several similar gags throughout the show.
The Voiceless: Plank, at least to everyone who isn't Jonny. Eddy also becomes this in "Button Yer Ed", when a fly gets lodged in his throat, only allowing him to make wheezing, squeaky noises.
In "Pass it on Ed", Eddy implies that his brother is lactose intolerant.
We Want Our Jerk Back: Edd tries to reform Ed and Eddy, and eventually realizes they were better as they were before, but it turns out they were just playing him the whole time and hadn't really changed.
Subverted in the movie, in which he left right after the whole quicksand prank, and it only took a fight and Eddy admitting his faults for him to come back.
Where the Hell Is Springfield?: Purposefully invoked by the creator. There is no real clues to exactly where Peach Creek is located, but in the movie alone we see that just outside the suburb confines is a large stretch of badlands, then grassland, then farmland, and then a swamp.
Write Who You Know: All the characters are based on either facets of creator Danny Antonucci's personality, family members, or people he knew growing up. Yes, even the Kanker Sisters and Eddy's older brother.
You Are Grounded: "Three Squares and an Ed". Eddy and Edd attempt to bust a grounded Ed out of his house. They get caught and are all grounded in the end. Ed and Eddy are grounded for unknown periods of time, while Edd gets off easier because he gets 3 days, which is plenty of time to spend with his thousands of ants.
For some reason, his parents decided to punish him... by removing the stairs. Edd even comments on how bizarre this is.
In "A Case of Ed", Kevin, for unknown reasons, has been grounded, and Eddy is not above taking advantage of this to torment him throughout the episode. However, Kevin gets off early for good behavior, and uses this to get even with Eddy.