Other mistake: After the turkeys start attacking in "The Running of the Turkeys", Mr. Fishoder and his brother start running. In that clip a Turkey pops out the side of a guy's head. Look in the mid lower right side. Looks like a design error. Pretty big error, no slow down needed to see it. (00:05:20)
Other mistake: Tina ends up in second place after joining the KIS racer. In the next scene, the family is shown eating dinner. They are shown eating their meal from what is Tina's bedroom and not the kitchen (the room with the fire escape is the kitchen). (00:13:07)
Other mistake: When Bob and Louise are trying get the theater for the Hawk and Chick film festival, the employee tells them the last showing on Saturday at 11 pm. However, after the film is shown, Bob makes a remark about the time and asks if it is a school night. Gene says yes and he has a big test the next day. If the film festival happened on Saturday, then the next day would be Sunday. There would not be school.
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: S04e15, "The Kids Rob a Train."
Bishop73