At Booger's bachelor party, the spy camera is permanently fixed inside a statue, and is stationary. Later, when Jeanie's father shows the video to his family, the shots are panned, when they should have been stationary like the camera was.
When Trevor Gulf (John Pinette) is dancing, the hat he's wearing comes and goes between shots.
In one scene at the prenuptial party, Lois has torn her dress off and Harold chases her alongside the pool. In the very next scene, they are in the background of Trevor dancing and Lois's dress is still intact.
Lewis tells Betty he did the bunny hop with the women at the stag party. They actually did the conga.