This episode was Steve Carell's submission for Emmy consideration.
Angela Kinsey is pregnant in the last few episodes of the fourth season. It is noticeable some of the time, especially in her face, but there is always either something blocking her stomach or she is behind a desk or table. The only partial shot on her body was when an Office employee opened the ground floor door to the carnival party at the parking lot.
This is the 14th and final episode of the fourth season, which was shortened considerably by the Writers' Guild of America strike. As often the case with two part episodes, this is considered episode 14 and 15 in syndication.
At the exit interview, Michael suggested to Holly to check out the baler, which was mentioned in season 3's Safety Training (2007), and Michael had been specifically told not to use it.