Continuity mistake: At the beginning of the movie, we see a portion of the climax where Robotnik is chasing Sonic. At one point in the very first shot, he runs up the side of a building, onto the roof, then back down. However, when we see the complete chase at the end of the film, he never runs up that building.
Trivia: On the rooftop in San Francisco, at one point Sonic starts tapping his foot and looks at his wrist. This is a reference to the "idle animations" from the first few "Sonic" games for the Sega Genesis, in which he does something similar if the player doesn't push any buttons for a while.
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