Continuity mistake: At the end of the dress rehearsal, when the policeman looks around the corner, someone's shirt appears on the armrest of Nathe's chair. (01:01:40)

The Full Monty (1997)
Directed by: Peter Cattaneo
Starring: Mark Addy, Robert Carlyle, Steve Huison, Tom Wilkinson, William Snape
Continuity mistake: The lads have been caught by the police during the dress rehearsal. Their names are being taken and the clock on the wall in the police station says 11.40 a.m. - it's in daylight. The security videos are brought in and the time on the one they watch is 12:27. (01:02:15 - 01:03:40)
Deliberate mistake: In the very first scene, with Dave, Gaz and Nathan in the abandoned steel works, they only have one girder, but when they're on the car in the middle of the canal, they have two: one balancing on the car roof, and the one Nathe walks across.
Gaz: Oh, fucking hell, Nath! They're 20 quid each them.
Gerald Arthur Cooper: Fat, David, is a feminist issue.
Dave: Well, what's that supposed to mean, when it's at home?
Gerald Arthur Cooper: I don't bloody know, do I? But it is.
Gaz: I've got a degree in ass wiggling, mate.
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Answer: It's a sight gag. Dave's essentially stealing the candy, so the alarm goes off. When he crushes it, the alarm stops. It wouldn't really happen, but it's funny that the alarm stops when he removes the candy.
ChiChi