A Midwinter Night's Dream - S1-E17
Continuity mistake: In the opening scene when Daphne and Eric are talking, the dish towel over Eric's shoulder is laid flat in some shots, and is twisted up in others.
La Behemoth - S1-E54
Continuity mistake: As Marita walks over to the washing machine with a stack of clothes, its round door opens automatically between shots.
Continuity mistake: When Eric is talking to his tutor in the hallway after recieving an A- on a test, there is a poster in the background for Sex Ed. This changes though, from saying "Sex, Ed?" to "Sex Ed" throughout the scene.
Danny's Dead and Who's Got the Will? - S4-E12
Continuity mistake: At the start, when Fran joins Niles, she's holding a green mug in her left hand and a muffin in her right hand. But the mug and muffin suddenly switch hands when Fran and Niles head to the sofa.
Continuity mistake: When Beavis is getting the idea to use the plate as a discus, the amount of cookies on the plate varies depending on the shot.
Revealing mistake: When Lois and Clark are checking out Lenny Stoke and Derek Camden on Lois' computer, you can see the computer screen showing the script for Lois in that scene. (00:07:40 - 00:08:20)