Remember, one of the earliest Beavis & Butt-Head shorts, a monster truck crushes a row of porto-potties and Sturculius, Roman God of feces, rises up and fills the stadium with poo. B&B is surreal enough to allow space and time travel. They forgot that for awhile, but they're back on track.
No! Every fictional universe must be perfectly consistent, even more so than reality, or the creators have failed
Hmm, at the end, the Council of Beaves and Butts-Heads give Smart Beavis a medal for being the first Beavis or Butt-head to score. That medal was awarded by Queen Beavis and King Butt-Head... Five minutes after that ceremony: King Butt-head: "Hey, Queen Beavis? Huh, huh huh." Queen Beavis: "What? Heh heh." King Butt-head: "Aren't you, like, a chick?" Queen Beavis: "Uh... huh huh, yeah." King Butt-head: "So, uh, I could like, score with you? Uh huh huh." Queen Beavis: "Uh, oh yeah, heh heh." King Butt-head: "Dammit, why didn't we figure this out until after we gave the medal to that fart-knocker? Uh huh huh.