At about the 50-minute mark, Vargas tells Quinlan that he knows the shoebox did not contain dynamite, and that ten minutes earlier he knocked it onto the bathroom floor and it was empty. But ten minutes earlier the audience saw Vargas knock the box into the bathtub, not onto the floor.
When Pete Menzies beckons Hank Quinlan to come out of Tana's place, Quinlan's tie is outside of his shirt collar and around his neck. When Quinlan and Menzies are walking the tie is threaded through his collar and not on his bare neck.
At the beginning of the famous opening long shot, at the point where the bomb is planted in the trunk of the car, the reflection of a crew member is briefly seen in the upper left hand corner of the screen.