Continuity mistake: When Webster steals a huge diamond, one of the guards comes to from the chloroform and raises the alarm before Webster has left the building. As he hurries to leave, Webster gets shot in the left arm, and he must use a truck as a battering ram to break through a garage door; he does this, but the garage door is now on the front of the truck, obstructing Webster's view, until, suddenly, it vanishes - all that's left are the side bits of the garage.
Continuity mistake: When Jim comes to see Webster, Webster is in the bath with a sponge that he constantly wipes himself with, but the sponge moves from one hand to the other, repeatedly, without him actually doing it.
Plot hole: Webster meets Laura at a party and she takes him to her house - it's not really her house - and says he has to break in to show off his talents, but when Webster does break in, he walks into a pitch-black house and he walks straight to the light switch and turns on the lights, so Laura can come in to a lighted house. Problem is: Webster has never been to this house before, it's pitch-black inside (it's so dark we can't see Webster at all), and the light switch is not where most switches are - on the wall next to the door - it's on a pillar, which is really far away from the front door; there's no way he'd be able to go straight to it.
Continuity mistake: When Webster breaks into his first house, he has his briefcase open, so he can get at the items he needs, but before he leaves, he picks up the torch that is sitting on his closed briefcase - he never closed his briefcase; it was open all the time.
Factual error: When Webster is attempting to open his first safe, on the job, so to speak, he only turns the wheel once. Now, I am not an expert on safes, but I do know that the wheel must be turned back and forth, with the correct numbers, a few times, at least.
