The final film in the original Spider-Man Trilogy, released in 2007. Peter Parker, it seems, is finally living the life he wants — New York doesn't seem to be gunning for him, he's with the girl of his dreams, and he's managing to balance his normal life with the life of Spider-Man. But his overconfidence leads to tension with MJ when he begins flirting with Gwen Stacy (Bryce Dallas Howard); and Harry Osborn, having discovered that his best friend is Spider-Man, decides to take his father's Goblin serum and seek vengeance.Meanwhile, escaped convict Flint Marko is turned into the shapeshifting Sandman (Thomas Haden Church) after entering a particle accelerator, and is revealed to have been involved with the same criminal who killed Peter's Uncle Ben. As well, a mysterious alien organism crashes to Earth and bonds with Peter, enhancing his powers but also influencing his behavior for the worse. When this symbiote is abandoned, it finds refuge in a rival, Eddie Brock, Jr. (Topher Grace), who becomes the maniac Venom.
Advertised Extra: Venom, though a possible subversion as well. Venom was only in the movie for about ten minutes, but he surprisingly did a lot in ten minutes: He teamed up with Sandman and kidnapped Mary Jane, which led to Peter and Harry's reconciliation, which led to Harry's death, which led to Peter and Mary Jane's reconciliation. Basically, the plot couldn't have wrapped up without Venom taking action.
This really depends on whether you think of Venom as the combo of Eddie and the symbiote, or just the symbiote. From the idea that Venom is really the symbiote, only needing Eddie as a tool for revenge, then Venom has a lot of scenes, just no dialogue.
Anti-Villain: Sandman, who became a criminal in order to steal money to save his sick daughter.
Arson, Murder, and Jaywalking: In MJ's words regarding a possible relationship between Peter and Gwen: "How come you never mentioned her? She's your lab partner, you saved her life, she thinks you're a genius, and she had her polished fingernails all over you?"
Became Their Own Antithesis: After encountering the symbiote Peter goes through this and recovers once he realizes what it is doing to him and how he affects some others. It is still hinted that his behavior came from an internal desire to act this way.
Big "Shut Up!": Harry to Peter after Peter tries to explain that Norman accidentally killed himself. He either thinks he's lying or doesn't care since he always resented Peter.
Bittersweet Ending: Leans more towards the positive side: Harry is dead but made amends with Peter, and Peter has to come to terms with having acted like a colossal jerk, but he's managed to overcome his dark side, forgiven the man who (accidentally) killed his uncle, and it's implied that his rocky relationship with Mary Jane will heal, and they'll be back together again.
Casting Gag: In this film, Mary Jane, a redhead is played by natural blonde Kirsten Dunst, whereas Gwen Stacy, a blonde, is played natural redhead Bryce Dallas Howard (daughter of Ron Howard)
Chekhov's Gun: Peter discovers that amplified sound (i.e. standing next to a ringing church bell) disrupted the symbiote long enough for Peter to remove it. He uses the same tactic during the final battle to separate Eddie Brock from Venom.
Comic Book Movies Don't Use Codenames: Venom is never named at all. Likewise, Harry's costumed identity was referred to as "New Goblin" in promotional materials, but he's never even called that during the film. However, Peter does taunt Harry by calling him "Little Goblin Junior" at one point, which is the closest they come. This was barely averted with Flint Marko who gets called "the Sandman" exactly once during a broadcast.
Contrived Coincidence: All Raimi movies- and most movies in this genre in general, for that matter- have this problem, but this one takes the cake. Flint Marko just happens to fall into a scientific experiment that turns him into the Sandman; Harry Osborn just happens to get amnesia and forget that Peter is Spiderman (and get it back and decide to go from trying to murder Peter to...breaking up him and Mary-Jane), and the symbiote just happens to land next to Peter Parker and attach itself to his suit. And all of this happens on exactly the same night.
Deus ex Machina: The butler suddenly revealing the true nature of Norman's death to Harry. Word of God states that he was supposed to be a hallucination, representing Harry's good side, but he's seen interacting with Harry in Peter's presence, who doesn't act as if anything's wrong. Perhaps you can make sense of it by assuming the butler does exist (and he is in fact in the previous movies, though practically just an extra with more than one scene), but Harry hallucinated his realization in the form of said butler..
Disproportionate Retribution: Harry from the clearly knew what led to his father's end — specifically, that he was the Green Goblin — from the conclusion of the second film on, yet needed the majority of this film to forgive Peter for stopping a homicidal maniac... multiple rounds of Easy Amnesia helped this along.
Also Eddie Brock. Peter exposed Eddie's fraud against Spider-Man (which in itself was the result of Peter in the Venom Suit wrecking a camera that contained a legitimate picture of Venom Suit Spider-Man). Eddie's response? To go into a church and pray to God for Him to kill Peter. Then he got the Venom suit... Guess God doesn't like Spider-Man either. Which explains a lot, to be honest.
Eagleland: Type 1. There was no sense whatsoever in Spider-Man landing in front of the American flag right before the final battle besides a patriotic money shot.
Executive Meddling: It's common knowledge that Sam Raimi had no intention of putting Venom in the film, but was forced to by Sony because of the character's popularity.This was in direct contrast to the first two films, where Raimi had complete creative control.
They weren't lying at the time, since MJ was originally going to have a more proactive role in the film's climax (Gwen was going to be the damsel while MJ would be the one to talk Harry into helping and forgiving Peter.) When the plans changed, they made sure MJ was an Action Survivor during this particular distress as means of making it up to an upset Dunst. Throwing a cinderblock at Venom was thrown in and any of MJ's screams during the scene were recycled audio.
On the audio commentary, Raimi tells a rough story of coming to the process that in order to finish the movie on time, they had to put MJ in danger, which not only angered himself for reneging on his promise to Dunst before production started that he wouldn't, but that summoning the courage to tell her was one of the hardest things he's ever done in his long time in the business.
Foreshadowing/Call Back: In their earlier chase/battle, when Peter throws one of Harry's bombs back at him, he's not trying to hit Harry, but merely wants to distract him long enough to knock Harry off his glider and get away. Their fight later on in the movie ends with Peter doing the same thing, and thanks to the symbiote Peter's wearing, he's not nearly as nice about it.
Four Lines, All Waiting: One of the more common complaints about the movie was the fact that the presence of three major villains, each of whom has their own plot, as well as the romance plot, left the movie rather crowded. Keep in mind that, in both comics and cartoons, Spiderman fights multiple villains all the time with little narrative clutter- the problem was how the villains were handled, not the fact that there was three of them (other films, like Batman Begins or The Dark Knight, had even more villains, but were still successes).
Informed Flaw: Mary Jane's singing. Kirsten Dunst is a good singer and delivers a good performance in the third movie but her character is critically panned in universe for her broadway performance. In part justified because we're sitting in the front row with Peter who is meant to be oblivious to MJ's professional problems and one of the reviews remarked "her voice hardly carries past the first row."
Reckless Gun Usage: How Flint killed Uncle Ben. He was startled when Dennis Carradine came running over.
Retcon / Hijacked by Ganon: Whoops, turns out the guy Spidey killed in the first movie didn't kill Uncle Ben after all, Sandman did! We never see Uncle Ben getting shot in the original, but it still gives no indication that there was more than one robber involved.
Recycled Soundtrack: In addition to Christopher Young's score using Danny Elfman's themes (Elfman didn't return for this one due to his treatment on Spider-Man 2), several scenes used tracked-in Elfman cues from the first two films as part of music-centric Executive Meddling. (It's worth noting that Young's score is the only one of the series to be unreleased on disc.)
Series Finale: During development, the filmmakers weren't sure if there was going to be a Spider-Man 4, so they designed movie 3 to act as a series finale if need be. In retrospect, it seems to have been a wise choice (Sony wanted a movie as quick as possible, but Raimi couldn't give a script that fully satisfied him in time; a reboot came instead)
Shipper on Deck: She may like Peter herself, but Ursula is still all for him and MJ.
Temporarily A Villain: While he doesn't quite become a full-blown villain so to speak, Peter shows a semi-evil side when the symbiote he has on his suit results in a major increase in vengefulness and aggressiveness. He doesn't switch sides; he's fighting against the same enemies as he was immediately before; but the symbiote's influence has him doing things he severely regrets and that the series portrays as very clearly wrong.
Harry tries to murder Peter in the opening act before succumbing to Easy Amnesia and turning good again; he recovers but downgrades his villainy from "try to kill Peter Parker" to "ruin his relationship with Mary-Jane"; later, when he and Symbiote-Peter clash, its more a battle of two Jerkasses rather than a fight between a hero and a villain. In the finale, Harry ultimately becomes an Anti-Hero.
Vehicle Vanish: Harry pulls a particularly goofy one on Peter; Peter is looking through the diner window at Harry, who is sitting, smiling at him before vanishing in such a way that it simply looks like he threw himself to the floor.
"Well Done, Son" Guy: Harry clearly still has daddy issues, and Peter takes advantage of this to get one seriously devastating dig at him.
Well-Intentioned Extremist: Sandman genuinely wants to do good by helping his daughter out of her illness. Unfortunately, he has to steal money from various places as well as commit Accidental Murder of Peter Parker's uncle in order to do so.
Eddie Brock actually calls out "What the hell?!'" when black Spider-Man breaks his camera. He improvises: he takes out his digital camera and snapping some quick photos of the carnage as th police arrive, then downloads the images to his computer, takes one of Peter's Bugle images of Spider-Man in Times Square, Photoshops Spider-Man into one of Brock's own images, and recolors him black. This comes back to bite him when Peter exposes him, forcing J. Jonah Jameson to fire him.
Possible Actor Allusion, as Grace's character in That 70's Show frequently yells this line when his friends mess with him.
Within Parameters: The scientists running an experiment involving a particle accelerator and sand notice that the weight of the sand is greater than expected. They write it off as a bird that will fly away once the experiment starts. The "bird" is actually Flint Marko, about to be turned into The Sandman. I want to know exactly what sort of 200-pound bird the scientists were thinking of.
Brilliantly parodied in this video. For brevity's sake, just jump to about 1:50.