Inside the prototype Xbox version of Pac-Man World Rally, files pertaining to Snoopy from Peanuts and a vehicle for him can be found. While the initial discovery of these files left a lot of mystery over whether they were leftovers from another project or a scrapped crossover, a concept image from World Rally would emerge shortly after revealing Snoopy was indeed planned as a crossover racer.

Smart Bomb Interactive, the developers of Pac-Man World Rally, worked on the game Snoopy vs. the Red Baron around the same time, and a few shared files from that game including placeholder cutscene dialogue can also be found in Pac-Man World Rally's data.

Pac-Man World Rally was originally going to be based on the works of famed psychedelic hot rod cartoonist Stanley Mouse. Fygar's kart is a leftover from this version of the project, hence why it doesn't fit the aesthetic style of the other karts and isn't directly based on the Dig Dug franchise.