Revealing mistake: During the pirate attack, Rosencrantz sits up in bed, narrowly avoiding a sword that's thrust through the wall next to him. Just before the sword appears, the film jumps a little. It also jumps again just after the sword has been withdrawn and he lies back down. Clearly these two motions (him sitting up and down in bed and the sword appearing/disappearing) are two separate takes that were spliced together.
Rosencrantz and Guildenstern Are Dead (1990)
1 revealing mistake
Directed by: Tom Stoppard
Starring: Gary Oldman, Tim Roth, Richard Dreyfuss, Livio Badurina
Continuity mistake: When Guildenstern tells The Player what he thinks is wrong with Hamlet ("A man talking sense to himself..."), he is holding his hands together in the close-up but not in the wide shot. (01:03:40)
Rosencrantz: Do you think Death could possibly be a boat?
Guildenstern: No, no, no. Death is not. Death isn't. Take my meaning? Death is the ultimate negative. Not-being. You can't not be on a boat.
Rosencrantz: I've frequently not been on boats.
Trivia: Even though the characters themselves are constantly confused as to which of them is Rosencrantz and which is Guildenstern, there is a way for the audience to make sure: In the scenes where they take part in "Hamlet" and interact with others, Gary Oldman always delivers the lines of Rosencrantz, and Tim Roth always delivers Guildenstern's.