When the three get "Kidnapped" by the pawn shop owner and his friends. The gags they are wearing go from tight to very loose in between shots.
When the drug dealer hugs Derrick, he is alternately holding/not holding a gun between shots.
Position of the guns in the "Kill Whitey" group meeting.
When Derrick is scolding the "Black Militants", the leader is alternately wearing/not wearing his shades between shots.