Revealing mistake: The Clown: When wearing the Seething Entertainer outfit, The Clown has a belt hanging down on his right leg. When the Clown does the knife flip animation and leans forward, this belt clips inside his leg with most of it disappearing.
Revealing mistake: The straight freeway section for Down and Dirty Valley with a construction barrier on the left side of it has the exit sign written backward if on the ground. This appears to be due to the creators flipping its inverse counterpart backward and then forgetting to flip the sign itself back to forward.