Continuity mistake: When Willoughby captures Crash McDash, he places the handcuffs on McDash's left hand. When McDash forces Willoughby into the barrel of water, the handcuffs are now on his right hand.
Continuity mistake: When Willoughby parks his scooter near the wall of the prison, he steps off the scooter and you can see he has nothing in his hand. When we see Willoughby in the next shot, he is now holding an umbrella.
Continuity mistake: When Crash McDash starts banging on the prison doors, wanting to come back in, the doors have rivets on them. But in a full length view of the prison in the next shot, the rivets have gone.