Continuity mistake: Multiple times throughout the show, Kimber can be seen in quick shots with light pink hair (the same color as Jem's), when her hair color is actually a dark pink/red color. (02:00:00)
Factual error: When the large Dutch guy tells his story about his life in Holland, there are a several windmills. However, the blades are placed on the wrong side, that way it's not possible for a windmill to turn clockwise, which it does. If the blades were placed correctly, they would still turn to the wrong side, because wooden windmills in The Netherlands are always turning counter-clockwise.
Used Car/Bounty Hunters - S8-E9
Continuity mistake: In "Used Car", when Beavis and Butt-head first approach the car, it's in between two trucks, a white one and a brown one. At the end, the spot where the car was is now between a green car and the white truck.
Revealing mistake: In the scene at the beginning when Scarlett is signing autographs after hers and Gunnar's small concert, you can see her signing a poster with a marker that doesn't leave any ink on the poster. (00:08:15)
Lisa's Song - S3-E14
Factual error: Doris finds out that Gypsy Queen "Lisa" died from influenza around 1918, so she didn't get to star in her performance. However, when Doris and Lisa's ghost are singing their duet later, Lisa's hair and costume are 1980s style, instead of the era she died.
Continuity mistake: In Season 2, Episode 19 ("Checkmate"): Detectives Torres and Moreno respond to a radio call reporting gunfire at 300 East 85th Street, which they acknowledge. We then see the suspect exit the building and escape in a car, and the detectives run unto the same building a few seconds later. The building number however is 237, not 300. (00:33:35)
Continuity mistake: The woman that asks Jemaine out on a date backstage repeats an action twice. Before the scene cuts she looks to the right toward Jemaine. In the next shot from a different angle she does this again.