Bobby Cannavale won the 2005 Emmy for Outstanding Guest Actor in a Comedy Series for his performances as Vince D'Angelo.
This season was meant to establish Will having a serious relationship for once, while everyone else ended up single. That's why instead of doing the obvious, and having him break up with Vince, they decided to keep him going.
The episode was grilled by several critics (as well as the Season 7 premiere) because many felt the writers had no material left, and had to go to celebrity guests to keep it moving.
This episode was filmed first, but was given a production code of being filmed second. It is unknown why.
Grace: Can you at least stay five more minutes?
Will: What do you need me for? You're just sitting around picking at a scab.
Grace: I cut myself shaving three weeks ago and it still hasn't healed!
Jack: I'm so nervous, I haven't had a danceoff since high school. Well, it wasn't so much a danceoff as I was beaten up by the football team.
Will & Grace is set in New York, which would make Vince a NYC cop. However, his uniform resembles that of an LA cop instead.
Janet: I feel this connection between Jackson and 5, I don't know what it is?
A cheap and funny reference to her older brothers who once formed the group, The Jackson 5.