SPOILER: There is a scene that appears with the closing title: Dr Robotnik, stranded on the Mushroom Planet, now completely unhinged and sporting his iconic bald head and mustache, begins scheming his return.
SPOILER: There is a scene in the closing credits: Tails the fox, Sonic's ally, arrives on Earth.
The first part of the closing credits is a montage of scenes from the film rendered in video-game style.
The stars in the Paramount logo are replaced with Sonic's rings, and is accompanied by an orchestral version of the "Green Hill Zone" music from Sonic's video games.
The Sega logo in this film is made out of various video game screens playing Sega games, with the first ones seen being Sonic video games.
The Original Film logo is in blue and red, Sonic's colors.
The byline in the Paramount logo had changed to ViacomCBS, this comes following the re-merger of the studio's parent Viacom and CBS Corporation which is completed on December 4, 2019, two months before the film's release.