When Jonah has jammed the cardboard compactor, setting off the alarm and alerting the rest of the staff, the safety gate on the front of the compactor is lowered, raised, and lowered again between shots without anyone touching it.
The "Jonah" mannequin has a different body when it's in the figure skating outfit. The body is tanner and does not have visible joints in the legs.
At several points, Jonah excitedly asserts that monkeys open bananas from the "bottom" and that it's humans who do it wrong. This is an urban legends. Monkeys do not consistently open bananas from the bottom. Most monkeys and other lower primates never encounter bananas in the wild. When given bananas in captivity, they do not consistently peel them in any particular manner, and often eat all or part of the peel.