Visible crew/equipment: The boom mike is visible in the left hand corner of the screen when Mel is talking to Bret and Jemaine in front of the store.
Rock This Bitch Till the Wheels Fall Off - S2-E6
Continuity mistake: The Moon Man award statuette Johnny Rock holds instantly changes position and hands while he speaks with Gigi.
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)
A Day in the Life of Retsuko - S1-E1
Continuity mistake: After Ton bashes Retsuko for not getting her tea right, she sings some death metal in the bathroom before joining Fenneko back at the computers and they start talking. Between them is a pink cup with some orange scissors, and an assortment of writing utensils. They are fanned out, but show that the red one is closed to Retsuko with the black in the middle and the yellow closer to Fenneko. When the camera changes angles to show them both sitting there, this order of pens is flipped, with the scissors still being in the same spot.
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)