Revealing mistake: In the final scene in the belltower you can see shadows from the surrounding trees. That's because this scene was shot at 3 in the afternoon. They just used a filter to make it look like it was night.
Vertigo (1958)
1 revealing mistake
Directed by: Alfred Hitchcock
Starring: James Stewart, Kim Novak, Barbara Bel Geddes, Tom Helmore
Continuity mistake: In the final scene, parts of Madeleine's hair come undone in the struggle inside the bell tower stairwell. At the top of the tower, before she falls, her hair is in perfect shape again.
Scottie: What's this doohickey?
Midge: It's a brassiere! You know about those things, you're a big boy now.
Scottie: I've never run across one like that.
Midge: It's brand new. Revolutionary up-lift: No shoulder straps, no back straps, but it does everything a brassiere should do. Works on the principle of the cantilevered bridge.
Scottie: It does?
Midge: An aircraft engineer down the peninsula designed it; he worked it out in his spare time.
Scottie: Kind of a hobby, a do-it-yourself kind of thing!
Trivia: Alfred Hitchcock appears 11 mins into the film walking past the building James Stewart is about to enter.