Revealing mistake: The boat is quite rocky, causing their food to move around the table. However, the plate obviously has wheels on it to make it move easier. (00:18:00)
Revealing mistake: Lucy and Vivian are trying to retrieve a $500 bill an elephant is standing on. They need to get the elephant to lift its leg. "Vivian says that won't work, that won't work." You can see the elephant has lifted its leg and the $500 bill has stuck to its foot.