Alex is seen in a flashback as the frontman of a band wearing a red, white, and blue jumpsuit. This is Dan Avidan's costume as one half of comedy music duo Ninja Sex Party.
Executive Producer Dan Harmon makes a cameo as an Executive Producer.
The outfit Dan Avidan (Alex) wears in his flashback to his rock band days is the actual outfit that he wears on stage with his band Ninja Sex Party.
In the first episode, each character has a flashback sequence which briefly shows their past. In Alex's, he is seen singing on a stage in blue spandex and a cape. This is the same outfit Dan Avidan wears when he is in his 'Danny Sexbang' character in his band Ninja Sex Party.