Sonic the Hedgehog

Factual error: Speed radar guns work by measuring the speed of an object that is either approaching or moving away from it. So when it shows Sonic running across, the beam giving the measurement wouldn't work, and he would have barely even registered on the device. (00:04:44)

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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.

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Trivia: The film's first trailer - in particular the design chosen for Sonic - was so poorly received, that the director confirmed on Twitter two days later that the studio was committed to changing the design to quell the backlash.

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Answer: Robotnik is a genius inventor and the quill is an incredible source of energy, so presumably he will use it to power whatever invention he can create that will help him escape the Mushroom Planet and return to Earth.

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