When Trivia goes to sit on the couch with Cousin Itt, she throws her right arm around him. In the next shot, only her right hand is resting on him.
When Trivia grabs Gomez in the basement and pushes him against the brick wall, the brick wall bends and wobbles, revealing it's plastic.
Trivia asks, "Where is that man?" after drinking Grandmama's potion. Grandmama then goes to the rope to ring the bell, but even before she gets there Lurch's shadow can already be seen moving towards them from the left part of the screen.
Trivia's glasses have no lenses.