One-Hour Season Finale. In syndication will air as two parts, "I Do" (Part 1) and "Oh, No, You Di-in't" (Part 2).

Leo admits to Will that he cheated on Grace while he was in Cambodia. When he calls Grace, she tells him she never wants to see him again.

At the wedding reception, Karen gets cold feet and changes her mind about the marriage. Jennifer Lopez sings "Waiting for Tonight" at the wedding reception. She later invites Jack to tour with her as a backup dancer.

Production services, facilities and hotel accommodations were furnished by The Ceasar's Palace. Ceasar's Palace president Mark Juliano appears as himself.

Debra Messing does not appear in this episode.

WIll: Hey. So you talked to her?
Leo: Yeah. I was completely honest.
WIll: Felt good, right? See, I knew. Grace responds to honesty. She doesn't often use it, but she responds to it. So what'd she say?
Leo: She never wants to see me again.
WIll: What? Over a kiss? Oh, God, let me talk to her. Okay, maybe you didn't say it right. I know how to handle Grace. I told her I was gay, and we're still friends. You know, and she was way more into me than she's into you.
Leo: Yeah, I didn't really tell you the whole story, Will. It was--it was more than a kiss.
WIll: How much more?
Leo: We slept together. I-I didn't plan on it. I-I didn't mean to. You know, it just-- it just happened. One time. Y-You're still gonna talk to her for me, though, right?
WIll: No. Now you're on your own.

Ethan, J-lo's back up dancer, trips and says it was on the shrimp tail. He actually falls a good 2 feet away from the tail.