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Near the end of the game, Spoiler:after the Egg Dragoon is defeated, Dark Gaia will emerge. When it goes back to Eggman (before he is hit by Dark Gaia), to the left of Eggman (his right) is a SEGA Dreamcast.
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During the opening cutscene, just as Eggman is about to fire the laser, you can see a Sega Dreamcast behind him.
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In the original concept work of the character "Chip", his name was "Whip", referring to whipped cream, as whipped cream was an early design motif. However, this was changed as some felt the name whip carried too many negative connotations in English (such as whipping as an act of punishment, or the injury known as whiplash).
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The lead composer of the game, Tomoya Ohtani, uses musical samples in some of his tracks for the game, similar to how Hideki Naganuma and Ohtani himself used samples in Sonic Rush and Sonic Rush Adventure, respectively. One amusing coincidence is that the intro of Windmill Isle is based directly from a remix of a track from the arcade-only game Ollie King, which Naganuma composed the entirety of.
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Knuckles and Shadow were planned to be in the game but the idea was scrapped for unknown reasons.
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In the ending cutscene, Spoiler:Chip says "Sonic you must live", but the subtitles mistakenly say "Sonic you have to live"
subdirectory_arrow_right Sonic Unleashed (Game)
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The Lick in Sonic Unleashed:
https://youtu.be/CFlW5WwlxGE?si=KUEmae8FM3rQjnKJ&t=30
Other examples of The Lick:
https://www.youtube.com/watch?v=krDxhnaKD7Q&ab_channel=AlexHeitlinger
Source for "The Lick" name originating in 2011:
https://www.cambridge.org/core/journals/twentieth-century-music/article/abs/virals-memes-and-the-licks-circulation-through-online-jazz-communities/143D4DD73A586587D5EC9E7EF0CEDF7F
https://youtu.be/CFlW5WwlxGE?si=KUEmae8FM3rQjnKJ&t=30
Other examples of The Lick:
https://www.youtube.com/watch?v=krDxhnaKD7Q&ab_channel=AlexHeitlinger
Source for "The Lick" name originating in 2011:
https://www.cambridge.org/core/journals/twentieth-century-music/article/abs/virals-memes-and-the-licks-circulation-through-online-jazz-communities/143D4DD73A586587D5EC9E7EF0CEDF7F
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