This was said, by the cast members of the dinner party, to be the hardest episode to film, due to laughter.
When Michael compares Jan to the devil and says that he's in hell, Jan is sitting right next to the fire in addition to wearing red. According to Jenna Fischer and Angela Kinsey, this was intentional.
At the dinner party, Michael introduced the three things he was proud of: The pine candle holder, the Dundies and the plasma TV. They are the only three items in the living room that belong to him. Everything else is according to Jan's erratic taste.
At 4:22, as Jan is beginning the tour of the master bedroom, there's a George Foreman Grill on a stool, at the foot of Michael's bench/bed. A funny reference to The Injury (2006) and Michael's love for grilled bacon first thing in the morning.
This was the first episode to air after the 2008 writers strike ended.