When Jimmy and Cindy are throwing the bananas, Jimmy makes noises, but doesn't move his lips. The most noticeable is after they show the monkey catching the bananas. If you listen closely, Jimmy goes "awww". But he doesn't move his lips. How's that possible?
However, it's a common thing on cartoon animation that the voice actor and the character's lips move different from each other. Or it's also a common thing with audio sync.