35. Vertigo (1958)
The Plot Hole: Scotty (James Stewart) has been hired to follow Madeleine Elster (Kim Novak), apparently possessed by the spirit of Carlotta Valdez.
He pursues her to the McKittrick Hotel, where the landlady tells her “Carlotta” hasn’t been in that day… and her car has suddenly disappeared, too.
Is Scotty really following a ghost?
Reasonable Explanation: We later learn that this isn't Madeleine at all, but Judy Barton, hired by the real Madeleine's murderous husband Gavin to help cover up her death. Clearly, Judy is messing with Scotty's mind.
That doesn't explain the sheer dextrousness and speed of her escape from the hotel, which Hitchcock leaves as a hangover from the film's surreal first hour.
Perhaps Gavin was lurking outside to zoom off in the car, while Judy remains in the hotel room, hiding in a closet?