Michael tells Erin that the cafe's door is always open because the lock is broken. Later, when he tells Erin to shut down the cafe, he throws her a set of keys. If the lock is broken, she would not need keys to get in.
When Angela refuses to exchange a dance for Michael's signature, she angrily turns away and leaves the room. A scene later during the large dance off, she is seen standing in the corner watching everyone else dance.
While trying to figure out who is going to Youngstown, OH, Dwight states "obtaining a learner's permit at age fourteen and half instead of fifteen" is one of the few reasons why someone would travel to a courthouse in Ohio. However, in Ohio you must be fifteen and a half to get a learner's permit, not fourteen and a half, while in Pennsylvania you must be sixteen, not fifteen.
While attempting to determine who in going to Youngstown, Ohio, Dwight states one reason for going there would be to go to a Superior Court. There is no Superior Court in Youngstown. Ohio has a Municipal and Common Pleas court structure.
When Phyllis injures her back while dancing, her mouth is censored before she swears.
Oscar mentions to Erin that he's been with the company 8 years. However, in season 4, he says he's been with Dunder Mifflin for 9 years. This would be a year earlier, so he's been with the company 10 years, not 8.
Jim and Pam were to be married in Youngstown, OH because it was the closest place where there wasn't a 3 day waiting period. Winchester, VA is closer, at approx 234 miles (3.75 hrs), compared to Youngstown, which is approx. 310 miles (5 hrs) from Scranton.