Continuity: Episode "Stewie B. Goode," S4 E28: When stewie is trying to get a drink from Bryan, there are two alcohol bottles on top of the table. But one is gone for two shots, then comes back. Also the bottles change from closer to father.

Continuity: Episode "Stewie B. Goode," S4 E28: Bryan insults Stewie about the water and there is a water glass by Bryan's plate. Then it cuts to a shot of Stewie and Chris, and the glass is gone.

Continuity: Episode "Stewie B. Goode," S4 R28: The bar owner puts two drinks on the table with olives in them. When it cuts back to the table, Stewie's drink doesn't have the olive in it anymore.

Continuity: When Chris hides the vodka from his teacher, he holds his right hand behind his back with his left arm at his side, but in the next shot, both his hands are behind his back.

Revealing: When Peter and Lois are driving to Cape Cod, the scenery flashing past is just the same few trees over and over.

Factual error: At the end of Peter's trombone solo, he holds out his last note. While holding the note, he moves the slide with no change to the note whatsoever. Since the pitch of the trombone is controlled by the slide, it would be impossible for Peter to move the slide as much as he does without changing the pitch he's playing.

Continuity: When Peter and the chicken are fighting, everything in the road vanishes instantly.

Continuity: Right at the start when you get an aerial shot of the bowling alley, there is one that gets a strike. The machine sweeps them away, but the pins still remain.

Continuity: When Tom Tucker is reporting about Peter saving Horace, his angle in relation to the bar changes.

Continuity: During the Star Wars rip-off at the end, just before Peter climbs the Town Hall stairs, the people on the sidelines change.

Continuity: After Quagmire jumps through the window, the glass shards on the ground disappear.

Other: When Peter is painting the Sistine chapel, he has blue paint on his brush, even though the picture is entirely black and white.

Other: During the Vagina Monologues show, the pair of legs casts a shadow but the microphone stand doesn't.

Continuity: As Brian is saying "OK, you know what, fine, you are a genius", the glass of water disappears.

Deliberate "mistake": In season 4 episode 7, 'Brian the bachelor'. Cleveland is sitting in a chair in a waiting room and is getting really nervous. Peter tries to help him by tying him to a chair and when that doesn't work, he takes off all of their clothes. Peter ties Cleveland's hands to the arms of the chair and then takes Cleveland's clothes off. He couldn't have taken the shirt off while Cleveland's hands were tied to something without untying him or ripping the shirt, which he didn't do.

Continuity: When Chris is sitting on his bed talking to Doug, the squares on his quilt pattern get smaller.

Continuity: Just after Lois decides to get rid of Chris's pimple, the pimple changes position in relation to Chris's hair.

Continuity: When the Griffins are discovered by Joe, Peter switches from his Sumo outfit to his regular outfit in a matter of seconds.

Other: When Stewie is playing Simon Says, the sequence Stewie plays is different than the one that the Simon Says played. If he played it wrong, there should have been a sound from the Simon Says indicating that Stewie played it wrong.

Continuity: Osama bin Laden's dialysis machine disappears after Stewie knocks him down.