Continuity mistake: The "Santa" carrying the Molotov Cocktail walked up the steps and past the decorated handrail, but he was standing within the length of the handrail (about mid-way) when the camera shifted from the right-rear to left-rear side. (00:02:40)
Continuity mistake: When Detective Knight and Casey are playing cards, the positions of the cards, cigarette box, and loose cigarettes change several times. Near the end of the scene, Casey's view of the cards does not show a "bet" cigarette below the cards, but there's one there when he gathers the cards. (00:11:54 - 00:12:47)