Continuity mistake: The front door of the Sternwood's is in the first shot of the movie as Marlowe rings the door bell. The front of the door has just one indentation near the knocker, later we see the front door again as Marlowe brings Carmen home and now it has two indentations. (00:01:15 - 00:25:15)????
Continuity mistake: Earlier in the movie at Geiger's house, Marlowe calls Chief Insp. Bernie Ohls of the District Attorney's Office and the six digits of Bernie's phone number are 122-145. At the very end of the movie he's with Lauren Bacall at Geiger's house and again calls Bernie Ohls. This time he dials the same phone number at the DA's office but leaves off one digit 12-145 and the call still goes through. (00:59:55 - 01:52:10)????
Continuity mistake: When we first see Harry Jones' body lying on the floor his shoulder is even with the split in the two cushions on the left of the couch. In the next shot we see him again lying there and his dead body has moved six inches to the right in relation to the cushions on the couch. (01:32:25)????
Continuity mistake: Lauren Bacall walks into a restaurant, and sees Marlowe at the bar with his head tilted back as he finishes his drink, and says, "Hello". The guy to the right of Marlowe is looking at the bartender but in the next shot his head has turned ninety degrees as he's now talking to his friend. (01:00:10)????
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)????