When Pleasure gives Happiness the gun, the cut on his face has only one bandage shown, but in the rest of the movie there are two.
When Happiness is fleeing on a motor scooter, the street pavement repeatedly alternates between wet and dry.
There are no visible marks or blood on Love's face when he's in the car after being beaten up by Sorrow securities.
When Fingers wants Pleasure to listen to some music, the remote doesn't belong to this type of B&O stereo. This stereo always uses a beolink 1000 remote.
When Gina is in the hospital, we see the patient monitor in demonstration mode ("demo" is flashing). It also indicates the patient is an adult male.
When "Fingers" shoots "Pleasure" in his apartment and and they show a close up on the ejected brass hitting the carpet, it is obvious that the brass is from a blank. It has the "crimped" end on it where it was sealed.