Street Fighter character "Dan Hibiki" is humorously mentioned as being a past student at the dojo. In a deleted scene, Ken questions Goken regarding Dan. Goken mention Go Hibiki (Dan's Father) and Sagat the boss from the original game.
The character Ryu was based on martial artist Mas Oyama who was Japanese by Nationality but his Ethnicity was Korean. Interestingly, Japanese character Ryu is portrayed by Mike Moh who is Korean by Ethnicity.
Mike Moh replaced Jon Foo as Ryu from Street Fighter: Legacy (2010), when the actor was unavailable to reprise his role due of schedule conflicts.