When Roy walks into Poor Richards' bar, there is a Fat Tire sign in the background. Fat Tire is a beer brewed by New Belgium Brewing company in Colorado, and they do not distribute their products to Pennsylvania.
Michael and Dwight drove way early to David Wallace's house. After the party actually starts, Jan has pulled up in her car and has Michael sign a waiver for their relationship. But after the party ends, Michael, Jan, and Dwight are driving back to Scranton in Michael's car, but where is Jan's car.