When the plate breaks, Beavis and Butthead start laughing. However beavis's mouth doesn't move.
Beavis, Butt-Head and Stewart Stevenson are at Stewart Stevenson's parents house watching the Summer Olympics. The Summer Olympics didn't happen in 1993, it happened in 1992.
When Beavis is holding the plate with cookies on it, there is about three, but when the scene goes back and forth from the T.V. to the plate, there is at least eight cookies.