Continuity mistake: When Beavis is getting the idea to use the plate as a discus, the amount of cookies on the plate varies depending on the shot.
Beavis: Hey Butt-head, is it normal for the inside of your bunghole to itch?
Butt-head: Beavis, it's not even normal to ask.
Trivia: Mike Judge not only received complaints about "Beavis and Butthead", but also some death threats, including a poem about the writer wanting to kill him.
Crisis Line - S4-E27
Question: Why did Mr. Van Driessen only give Beavis and Butt-Head one phone?