TedStixon

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: In the beginning of the film, young Sonic gives Longclaw a flower with spiky petals. This flower is actually based on a flower sprite from the original "Sonic the Hedgehog" video-game for the Sega Genesis. (00:02:16)

TedStixon

Trivia: When Dr. Robotnik is picking out a song for the dance scene, you can briefly see the band "Crush 40" listed among the artists and playlists on his holographic projection. Crush 40 did music for the "Sonic the Hedgehog" video game series.

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Trivia: During the final battle, Sonic cripples Robotnik's ship by curling into a ball and bashing into it repeatedly. This is a reference to the video-games, in which Sonic deals damage to bosses (which are typically Dr. Robotnik) by jumping into a ball and crashing into them.

TedStixon

Trivia: Sonic makes a few brief references to the "Fast and Furious" movie series. This movie is produced by the same team that produced those films.

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Trivia: During the bar scene, Sonic grabs some chili dogs out of the air and quickly wolfs them down. This is a reference to the overall "Sonic" franchise, in which his character absolutely loves chili dogs. (A fact that was first established in the cartoon "The Adventures of Sonic the Hedgehog," and was later incorporated in other media and even the video-game series).

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Trivia: The headband Sonic wears while practicing with his nunchucks features the emblem from the title screen for the original "Sonic the Hedgehog" video-game.

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Trivia: The evil creatures that attack Sonic and Longclaw at the beginning of the film are actually echidnas. Echidnas are a very important species in the "Sonic" video-game lore. (00:02:20)

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Trivia: Sonic's map of the different worlds he can go to with his rings includes a few hidden easter-eggs. In the bottom corner of the map is a picture of a "Chaos Emerald" from the video-games. There is also a world with a checkerboard pattern, which is a reference to the bonus stage from "Sonic the Hedgehog 3."

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Trivia: In Sonic's cave, he has repurposed a street-sign into a ping-pong table. If you look closely, the sign reads "Hill Top Rd. Next Exit." This is a reference to the level "Hill Top Zone" from the video game "Sonic the Hedgehog 2." (00:07:07)

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Trivia: The (quite bad) picture of Sonic that "Crazy Carl" holds up is a reference to "Sanic," an internet meme involving a poorly-drawn picture of Sonic.

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Trivia: The "Mushroom Planet" is a reference to the level "Mushroom Hill Zone" from the video-game "Sonic and Knuckles." (Although some have speculated it may also be a sly nod to the "Mushroom Kingdom" from the Nintendo video-game "Super Mario Bros.").

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Trivia: There is a mid-credits bonus scene featuring the popular character "Tails" from the video-game series.

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Trivia: The town in the movie is called "Green Hills." This is a reference to "Green Hill Zone," which was the name of the first level in the very first "Sonic" video-game. Additionally, a piano rendition of the "Green Hill Zone" music is played towards the end of the film. (00:03:55)

TedStixon

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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Trivia: The film was originally written to be an introspective, existential dramedy geared towards adults about a troubled man who is turned into a cat. As originally planned, the cat also wouldn't speak/the audience wouldn't hear his thoughts. However, after a change in leadership at the studio, the film was rewritten into a more generic family movie.

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Trivia: Director Peter Medak stated that part of the reason he took the job directing the film was because the screenplay terrified him.

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Trivia: George C. Scott actually learned how to play several classical piano pieces for his role in the film.

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Trivia: Co-writer Russell Hunter has alleged that the film was loosely inspired by actual supernatural events he experienced while living in the Henry Treat Rogers Mansion in the 1960's.

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Trivia: Martin Scorsese called "The Changeling" one of the eleven scariest movies ever made in a list he published.

TedStixon