Hamburger Dinner Theater - S1-E5
Continuity mistake: In the opening sequence, when we see Linda at Dinner Theater, the first shot inside the venue shows Linda at a big table with four women. In the very next shot, the table has shrunk and the woman furthest on the left has disappeared.
Mutiny on the Windbreaker - S3-E4
Other mistake: When Gene slaps the pennies out of the woman's hand with the glasses her eyes turn white with an animation error where her coat and mouth intersect. (00:16:45)
Continuity mistake: In a scene after Teddy shows up at Helen's house, but before Helen arrives, Louise uses a picture of Helen to show that Helen has the look of a killer. In the close-ups, when the family is covering various parts of the picture, Helen has a closed mouth smile, but in subsequent shots Helen has an open-mouthed smile.
An Indecent Thanksgiving Proposal - S3-E5
Continuity mistake: When Mr. Fishoedor enters the restaurant, Bob is cleaning a coffee pot with a rag. In the next frame, the coffee pot vanishes from Bob's hand. Later, when the perspective is changed again, the coffee pot appears on top of a blue platform. (00:01:35)
Other mistake: When the Belcher family gathers water balloons at the beginning of fight, as Mr. Fischoeder says the line, "Every honky for himself..." a green water balloon magically rises into Gene's hand.
Answer: It's a made up song for the show. It's a synth version of what the kids sang in Mr. Frond's video at the beginning of the episode. "Let's Swap Eyes."
Bishop73