Revealing mistake: When Bob Crane was playing drums in the club, the night that he told Patti he and John were going out - he CLEARLY isn't playing to the beat, as you can hear drum fills, and he just playing as hitting the drum once with his left stick.
Revealing mistake: When Pally and Charlotte are in bed, Charlotte's pillowcase barely goes above the headboard, yet its shadow casts on the wall is much larger and higher, and has a triangular shape. (00:29:13)
Revealing mistake: When Dormer fails to pursue Finch during the log chase scene, he climbs out of the water by a ladder. If you look at Dormer's back as he gets out of the water onto the dock you can see an outline of the life jacket Pacino wore to film the scene. You can see the outline again when he turns around and walks up the walkway. (01:00:49 - 01:01:11)
Revealing mistake: In the scene where Joey is arrested, they handcuff him. When the police pulls him on his feet, you can see that the handcuffs are not on, but the officer is just holding them. (01:36:05)