Inside the files of M&M's Kart Racing is a placeholder loading screen image showing what appears to be a 3D render of a 2009 Chevrolet Corvette ZR1 photoshopped over the Red M&M driving his kart copied and pasted over and over erratically.

One of the CPU-only characters in M&M's Kart Racing is a female anthropomorphic fox named Foxy. This character's design bears a striking resemblance to a character named Foxy Roxy from the 1994 fighting game Brutal: Paws of Fury. The copyright holder of the game at the time of M&M's Kart Racing's release is unknown, but one possible candidate is Take-Two Interactive, as it acquired "certain software games" from developer and publisher GameTek after they went bankrupt in 1997. There appears to be no overlap in the two games' development staff, companies, or rights holders, so assuming that the design similarities are not a coincidence, Foxy may have been used in M&M's Kart Racing illegally under the assumption that Brutal: Paws of Fury was an orphan work.