The pitch document for Panic Room is interesting. For the final film, the son in the pitch was changed to a daughter, and the ending softened the fate of the last robber.
Also, the second paragraph of the pitch says that the entire film is to be shot from camera positions that are always inside the house, and at the end the penultimate paragraph reiterates this by saying “since we haven’t left the house for a single shot yet we’re certainly not going to start now” – but in the final movie, the film does end with scenes shot outside.
I haven’t thoroughly read the early Spider-Man drafts (the ones with the “Based on a treatment by James Cameron” credit), but the thing that struck me about the early pages is how stable and unchanged Peter Parker’s opening voiceover narration stayed until the final film. (“The story of my life is not for the faint of heart… If somebody told you I was just your average, ordinary guy, not a care in the world – somebody lied.”)
I noticed that the Spider-Man 1 drafts only credit Stan Lee as the character’s creator – though of course the final released film adds Steve Ditko as co-creator. But even in the Spider-Man 2/”Amazing Spider-Man” drafts dated July 2002 (after the first film’s release), Ditko’s name is still omitted form the start of the script.
Skimming through the August 16, 1999 draft, I noticed that on page 44 there’s a scene with Spider-Man hanging criminals up in webbing outside the police station, and a lawyer gets them released. That’s immediately followed by a scene where he comes across some cops beating up a teenager and says “If there’s one thing I can’t stand, it’s a bully with a badge.” (How relevant to today!)