Other mistake: While Sonic and Tails are locked up in old Spelunk's cage during the cave-in, right before the huge diamondius crashes on top of the cage, there's a close-up of Sonic holding the bars, and the color of his torso becomes the same as the background mid-shot.
Continuity mistake: In Subterranean Sonic, Sonic's arms turn blue in one scene when he's talking to Spelunk about politics.
