Easter Eggs and References
Sonic the Hedgehog 3 and its trailers contain the following Easter eggs and references:
Dr. Robotnik's ringtone is E.G.G.M.A.N., which is theme of Dr. Eggman in Sonic Adventure 2.
When the Eclipse Cannon's metallic moustache was setting up, it had the same sound as when the Eclipse Cannon was opening in Sonic Adventure 2.
As Team Sonic lands in Shibuya, they briefly go into the "flight formation" from Sonic Heroes.
In the first scene where Team Sonic meet Shadow, the camera starts off constantly showing him at an upward angle (as if to show he is not only physical, but in metaphorically above Sonic), just like the camera work of his first appearance to Sonic in the games.
At the beginning of their first encounter, Sonic and Shadow get into a confrontation about why they look like each other. This may be a reference to their first boss fight back in Sonic Adventure 2 where the both of them call each other “faker”.
One may see an advertisement for Chaos Soda and Sub Burger from Central City in Sonic Adventure 2.
When Shadow has finished decimating Team Sonic, the way Sonic tries to stagger to his feet before collapsing in front of Shadow is almost shot for shot the way he does the same during the opening movie of Shadow the Hedgehog.
Shadow gets surrounded by the Tokyo Metropolitan Police in the Shibuya Scramble Crossing, much like how Sonic got surrounded by G.U.N. Soldiers in Central City in Sonic Adventure 2.
Before Shadow prepares to kill Team Sonic with a mini black hole, Sonic tries to dissuade him by saying he doesn't have to be like this. Shadow replies, "This is who I am," which he says at the end of each of the game's routes.
In London, we see Sonic running around dressed like a royal king. This is a reference to a birthday-specific costume where he wears a king's outfit with a red cape and crown (Sonic Speed Simulator specifically calls this outfit Birthday King Sonic), which is visually similar to the one he wears while running through London.
One TV spot shows Sonic and Shadow leaping past each other in the same pose as in the intro for Sonic Adventure 2: Battle. They do the same pose in their Super forms and in the credits, and were also featured in the pose for the official Twitter account's post to commemorate the movie being the #1 movie in America for its debut weekend.[38]
Eggman falls off one of the catwalks near the end while on the ARK and dangles off it, similar to how Rouge did during her time on the same station in Sonic Adventure 2. Both are rescued by Knuckles, although in Eggman's case, Tails helps out.
In the process of stopping the Space Colony ARK from destroying the Earth, one of the hedgehogs lose their Super form and plummet to the Earth. In Sonic Adventure 2, it was Shadow, but in the movie, it is Sonic who falls.
Towards the end of the movie, Sonic and Knuckles have this conversation about their status as a team, with Sonic dropping the exact response he had for a team conversation from Sonic Boom: Rise of Lyric.
In credits feature polygonal Sega Saturn-esque models for the characters. In particular, Sonic, Tails and Knuckles's models are introduced doing their animations from the character select screen of Sonic Adventure. Their models, as well as Shadow's, are rendered in a very similar fashion to Sonic the Fighters.
Amy Rose and Metal Sonic debuting together in post-credits is quite fitting considering they debuted together in the same game, Sonic the Hedgehog CD as well.
Amy rescues Sonic from Metal Sonic. This is not the first time that the characters' roles in Sonic CD were reversed. Back in Sonic Mania Adventures, Amy switched roles with both Metal Sonic and Sonic.
Maria playing few notes on guitar is Live and Learn, which is the main theme of Sonic Adventure 2, and Maria Robotnik's debut.
Sonic saying "Talk about low budget flights, no food or movies, we're outta here." is a reference to Hero Story opening.
To commemorate the film becoming the #1 movie in America for its debut weekend, the official Instagram account for the films posted a recreation of Sonic Adventure 2's box art, which serves as the page image.