In an episode of Console Wars, Greg and Dan see whether the SNES or the Sega Genesis had the better Licensed Game based on the show. Over the course of the review, they become Beavis and Butthead themselves.
In "D'oh-in' in the Wind", Abe and Jasper, both high on spiked fruit juice, laugh like Beavis and Butt-Head while sitting on a park bench.
In "Large Marge", a protestor at an anti-Krusty demonstration holds up a sign reading "CANCEL BEAVIS AND BUTT-HEAD", with part of it crossed out and replaced with "JACKASS", and that part crossed out and replaced with "KRUSTY".
In "A Midsummer's Nice Dream", Homer is surprised that Bart doesn't know who Cheech and Chong are, saying they're the Beavis and Butt-Head of his generation. When Bart asks who they are, Homer laments he failed as a father.