The picture of "Darth Vaderstein" that Adam used was taken from the film "Fanboys", which used a composite shot of the head of Darth Vader and the body of Steve Carell from the poster for "40 Year Old Virgin".
The song played during the final scene is, "Hard to Say I'm Sorry", by Chicago.
In the scene at the golf course, Barry is wearing a hockey shirt attire. This is a nod to the film 'Happy Gilmore' which stars Adam Sandler who's Happy Maddison production company produces both the film and show. Also Barry does the happy dance like Gilmore does in the film.
On Adam's board you can see the (2007) fanboy movie poster which was written by Adam F. Goldberg. Dan Folger is in it, who also plays Murray's brother.
The game Barry is playing at the beginning of the episode is Operation