When the nerds are having their party with the moos; after Booger suggests having "wonder joints", you can see Judy drop a piece of chicken from the bowl she is carrying and she even notices she drops it. Nothing much but it's there.
I've noticed this also, many times. You found a true slip up. For a change, no one can argue with you, or question you on it. I notice no one has commented because they can't complain about it. WAY TO GO!