In this episode Michael is obsessed with pulling a gun during scenes in his improv class. Steve Carell says that this was inspired by a former student who, in his own improv days, always used to pull a gun during scenes.
Jim's yearbook photo is actually John Krasinski's real life yearbook picture.
In Jim's room there is a guitar on the other side of the bed. In a later episode Jim makes an avatar for "second life" that has a guitar on his back. Pam asks Jim if he really plays guitar and he denies it, trying to steer the conversation in a different direction.
In Jim's apartment, a doll, which bears a resemblance to Roy, wearing a Dunder Mifflin uniform is seen hanging from a noose.
After Michael's improv class, he overhears the group is going to Bernie's. That would be Bernie's Tavern, 1902 Jackson St. in West Side (Scranton).