Continuity mistake: Lauren Bacall asks, "How did you like dad?" and we see Marlowe standing by the liquor tray. The liquor on the tray has moved since she poured her drink, most noticeable is the top of the seltzer bottle that has rotated 45 degrees without anyone going near it. (00:10:00 - 00:11:15)????
Continuity mistake: Mona Mars throws water in Marlowe's face and as she leaves, we see three pillows propped up against the far wall in the back of the room. Later Marlowe gets up as Canino's car pulls in, and even though no one has gone near them the pillows have been rearranged. (01:39:05 - 01:40:55)????
Continuity mistake: Outside Geiger's house, Marlowe throws his gun down on the floor making Carol Lundgren reach for it. He kicks him and knocks him out but if you look closely he only touches Lundgren's left shoulder with his foot, nowhere near his head. He doesn't hit anything as he falls either. (00:58:55)????