Continuity mistake: When Nick and Casey go into Ballpean's flat, nick is frisked by the bodyguard, who finds no weapon on him. Casey refuses to be searched. When a fight breaks out, Casey pulls out two pistols, so we understand how he smuggled them in, by refusing to be frisked. However, Nick pulls a gun out from under his jacket. There was no way he could have smuggled this in without the bodyguard catching him when he frisked him. It's a big gun too, which would have made it even more obvious if he tried to hide.
Continuity mistake: When Thang and Rose approach Sal after searching the tunnels, the wide shot shows a large purple mushroom behind him to his left. Later on in the scene, after Gigi leaves, Thang tells him he's gotta be more careful, and it has disappeared. (00:08:25 - 00:09:25)
Continuity mistake: Annie Girardot and Murray Head are playing with the cake dough and playfully hit and splatter each other. Between the various takes, Annie Girardot gets some cleaning done, because she had hair and coat all messy midway through, but is much cleaner when that part of the scene is a wrap and the story moves on; the hair (she had an egg cracked on her head) is fine and the coat that had streaks of cream on the lapel is almost spotless. (00:25:20)
Continuity mistake: Rosina is meeting for tea the fish trader that she is supposed to marry. Her mother hands her the plate with cake, she takes it in the first shot, but she is taking it again in the following. (00:10:15)
Continuity mistake: When the two cats move past the yawning rat to go up the crane lifter, the door is shut, but they slip into its semi-opened door when they reach the platform in the next shot. (00:06:05)
Continuity mistake: When Lee and Chris go swimming they briskly towel off still a little wet. Yet a few moments later they're completely dry.