Bug: In the editor for Canyon Grand Drift, if you select the tunnel obstacle piece with a drop-off, the game will ask you to select a billboard despite none being present in the piece.
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.