There is a scene in the movie, where Catherine Zeta Jones and Lili Taylor enter a room,that spins with mirrors all around it, they show both of them stepping in, but a few seconds later, they show a close up of Catherine's boot stepping in, when they supposedly already went inside the room.
I think that they showed them stepping in the room like three times, but it was probably for dramatic purposes or something, cause they wouldn't miss something like that. I don't think that they are THAT dumb.
This is an editing technique known as a match on action. Meaning different angles of the same action. This is more widely used in action movies, most noteably XXX (the one with Vin Diesel) on a lot of the stunts, like the one where he jumps through a fence on a motorcycle. You see the same few seconds of action over and over again, but from different angles.
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