Continuity: When the body of Miss Lefferts is being viewed, the 'dead' girl blinks slightly.

Continuity: When Kevin Spacey is alone in the bar looking at the $50 bill (quite a close up), it's a bill dated from the 80's or 90's.

Continuity: The stunt double's hairline is quite different than the actor's, when Bud White holds him over the balcony.

Factual error: In the scene where Lt. Exley arrives at the Night Owl after the murder, the patrol officer is wearing a Safariland velcro-fastened handcuff case on his left hip. That style of rounded cuff case was not introduced until the early to mid 70s.

Continuity: In the scene where Lt. Exeley resets the clock, the first time you see the clock it is exactly 5 minutes after 2. When Exeley puts on his glasses to see the time, it is clearly only 3 minutes after 2 oclock!