Factual error: In the episode with Donny, when Bart sees principle Skinner go into the school to meet with the rat, the door is backwards. The bars that are pushed in to open a door are always on the inside. Submitted by Jack Kaltenbach

Continuity: When Homer lights his albums on fire, he watches Weird Al doing a parody of his song. When it's over, the fire is gone and there are no ashes where it would be. Submitted by Jack Kaltenbach

Continuity: When Homer is in his mansion watching Weird Al's parody of his song, the trash on his floor (frappacino cups, pizza boxes, etc.) keeps switching places. Submitted by Jack Kaltenbach

Continuity: When Sadgasm is making their first appearance, Homer says, "We are Sadgasm," and there are a few students walking around, but when he says, "And this song is called 'Politically INcorrect'," there is a big crowd in front of them with no time to form one. Submitted by Jack Kaltenbach

Continuity: When Marge is watching Homer's "Margarine" music video, the coffee in her cup keeps changing. Submitted by Jack Kaltenbach

Deliberate "mistake": When Homer is watching Weird Al's parody of his song, he never turns the t.v. on and it isn't already on, but somehow it turns on. Submitted by Jack Kaltenbach

Continuity: During Sadgasm's first appearance, a girl with a green skirt, a red sleeveless shirt and grey hair moves from place to place during the "concert." Submitted by Jack Kaltenbach