The "Puffy Shirt" first worn by Jerry Seinfeld in the 1993 Seinfeld episode of the same name, and again by David Hyde Pierce in the Season One Frasier episode, "A Midwinter Night's Dream", can be seen in this episode worn by the guy that asks Roz if she's here alone.
When Daphne is speaking to Niles during the party, she reaches to her right eye with a tissue. However, when the camera changes, she is reaching for her left eye.
During the period where Frasier is responding to the allegation that he is the father of Roz's baby, you can see Peri Gilpin begin to enter and then step back and hide for a moment before making her real entrance. Some might argue that the character Roz hesitated when realizing that everyone was discussing her, but it is such a background event that it is unlikely. What's more, nothing was being said at that moment that referred to her, specifically. Timing her entrance was important since her line must correspond to Frasier saying that they didn't even know for certain if there was a baby, in response to which she appears and says "We do now".
Frasier: No! Listen, everybody, I am not the father of Roz's baby! In fact, we don't even know for sure if there is a baby!
Roz: (appearing) We do now.
Man: Oh hello.
Man: Are you here alone?
Roz: Oh god I hope so.
Frasier: Roz, you come in here looking ghoulish, even for Halloween and you sleepwalk your way through my entire show.
Roz: Oh, I'm sorry Frasier.
Frasier: Sorry just doesn't cut it, Roz. What possible explanation could there be for this level of unprofessionalism?
Roz: I think I'm pregnant.
Roz: On line two we have Bill, he's going through a very difficult transition.
Frasier: Hello Bill.
Woman's voice: Hello? Is someone there?
Frasier: Well, I see we're pretty much through our transition now, aren't we Bill?
Frasier: Roz, who's on line?
Roz: Uh, on line four we have, uh, Ted who's feeling a little disconnected.
Frasier: Go ahead, Ted.
(sound of a dial tone)
Frasier: Well I hope Ted appreciates irony.
Frasier: (on discovering that Roz may be pregnant) But Roz, how?
Roz: I don't know how. No one is more careful than I am when it comes to birth control. But then again, even the best protection is only effective ninety-nine out of a hundred times. I can't beat those odds.
This episode received a 1998 Emmy nomination for Outstanding Costume Design. Pamela Fryman was also nominated for a 1997 Directors Guild of America Award.
When Roz comes to the party she is asked which literary figure she came dressed as; she responds by saying, "I'm O, from the 'Story of O'".
'Story of O' (Histoire d'O) is a French erotic novel written by Anne Desclos under a pen name, Pauline Réage. It tells the story of a woman who undergoes dominance and submission training to become a slave, which accounts for Roz' suggestive outfit.
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