Continuity mistake: Eddie Mars pours Marlowe a drink and he puts the bottle down dead center on a tray on top of the liquor cabinet. He doesn't go near the bottle but later when we see it again it's right of the center of the cabinet, and in the last shot of it it's to the left of the center of the cabinet. (01:08:20 - 01:09:15)????
Continuity mistake: Marlowe walks into the apartment and Joe Brody pulls a gun on him. Joe holds the gun in his right hand and his cigarette in his left, and we see the smoke from the cigarette rising into the air. In the next three shots the smoke has disappeared, then the next time we see Marlowe and Joe together in a wide shot the cigarette and the smoke are back again. (00:49:10)????
Continuity mistake: After Canino knocks him out, Mona Mars is there with a glass of water when Marlowe wakes up. If you look behind them on the table to the right of the lamp, there's a small cardholder. No one goes near it but several shots later when Lauren Bacal walks over to sit with them, the card holder moves about a foot to the right. (01:36:55)????
Continuity mistake: In Geiger's house when Marlowe finds the hidden camera, we see a vase on the left of the fireplace and it's shadow falls directly behind it. Marlowe doesn't touch any light switches but later in the scene the lighting has changed and the shadow of the vase is now falling to the right of it. (00:22:45 - 00:23:35)????
Continuity mistake: The next morning after going to Lido Pier, Marlowe walks into the waiting room of his office and Lauren Bacall is sitting there reading a magazine as she waits for him. The lighting on her changes and the picture on the wall behind her head is lowered about six inches between shots. (00:32:20)????