In the establishing shot of "The Y" you can see a DeLorean parked in front of the building. This is Stan's DeLorean and is a reference to the Season 4 Episode 16 episode Delorean Story-An (2009).
Roger's Outfit in the second half of this Episode is the same that Denzel Washington wore in Spike Lee's 'He got game' (1998)
Roger's outfit when he is playing basketball is the same as Wesley Snipes in White Men Can't Jump (1992).