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Ratchet & Clank: Rift Apart is just Sonic Rush.
Both games are about two alternate counterparts of furries who are nearly identical in terms of abilities (with minimally different execution).
In the Sonic the Hedgehog and Mega Man crossover event Worlds Unite, Sonic Man is able to move through stopped time.
Tails is very discontent with the fact that Eggman has settled on making Tails Doll rather than a Metal Tails.
Moreover, this suggests that he finds Metal Sonic and Knuckles to be particularly cool.
In Sonic the Hedgehog (2006), Silver claims he cannot grab lasers with his psychokinesis. Despite this, he seems capable of doing exactly that with Dark Enerjak's attacks, redirecting them at him.
This is somewhat debatable, as it's uncertain if he can influence Chaos energy.
Mighty's falling sprite from SegaSonic the Hedgehog reveals that his shell may be removable.
Sonic Lost World's original soundtrack "Without Boundaries" is a clever reference to the lack of boundaries of respect towards people with eyes.
Tails is revealed to own a figure of the Undertale character Mettaton EX in IDW Sonic #49.
Muttski is Sonic's pet dog from the Satam cartoon who was roboticized alongside Uncle Chuck. He was carried over to the Archie Comics, deroboticized, and due to the Super Genesis Wave, was turned into a Mobian dog.
He now goes by the name Ben Muttski and is Chuck's apprentice.
According to Tails' creator Yasushi Yamaguchi, his favorite car is the Lotus Super Seven, it's even present in his bonus image in Sonic CD.