Continuity mistake: At the beginning when the lady at check in is passed out on the floor, she is right up against the desk, but when Lois goes behind to tend to her, she is further away from the desk, and closer to the wall.
Ozzie and the Bridge Group - S6-E34
Continuity mistake: Ozzie goes to a boxing match. Stock footage shows two boxers fighting in a ring surrounded on all sides by ten rows of seats. Almost every seat is occupied. The close-ups show Ozzie sitting in the front row and there are only three rows of seats behind him.