Steve blurting out "hippo" during a moment of confusion is based on a similar mishap involving Jeff in season 3 episode 2, "Faithless."
When Sally thinks that she is pregnant, she names the possible father as Peter, the man with whom she was in bed when Patrick arrived to "save" her from the spider in the episode "Remember This".
(Susan finds Patrick with Steve at the fertility clinic)
Susan: You didn't really think you got to have sex with one of the nurses, did you?
Patrick: I did.
Susan: Patrick, you are a sad and twisted man.
Steve: No, Susan. He did.
Sally: I'll get the speech about how wonderful I am. Basic rule, isn't it? More wonderful you are at the start of the speech, the more dumped you are at the end.
Jane: I'm absolutely 100% not pregnant. Look at it, Sally. I'm in the clear. I've shagged and shagged and shagged and all the little bastards missed!
Jane: I was really suprised when you got it together with Julia. I always pegged you for - well, you know...
Jane: Dying alone.
Jeff: So sometimes, ugly people could be really beautiful on the inside.
Jane: No that never happens.
Sally: I'm going to have a baby!
Sally: A bald noisy thing with eyes is going to crawl out of my genitals and destroy my life. And my mother is going to side with it!
Jeff: I get very tense around apples... Well, I get very tense generally. I think I've fallen into the trap of blaming fruit.
Jane: Do people really call me "The one with breasts"?
Jane: What do they call you?
Sally: Are you two absolutely certain you're not pregnant.
Susan: You know, we've got to develop a new form of greeting.
Steve: I'd like to say for the record that I was against the costumes.
Jeff: I wasn't!
Steve: And the dancing.
Jeff: I invented this dance!
Steve: He wrote it down.
Jeff: I did!
Steve: He's planning to present you with the early scetches.
Jeff: Come on Steve, you know you want to!
Steve: This is a romantic moment Jeff, you sudden death might kill the mood.
Jeff: Porn-wise, lesbians are like a jam sandwich, without the sandwich and just the jam. Fact, lesbians are just a big blob of jam. Well, not actually. Unless they've exploded in all the lesbonic excitement.
The end credits are scrolling upwards in front of a white background while a blue line slowly appears from the top centre. This is a reference to the kind of pregnancy tests (a blue line indicating pregnancy) which were important to this episode's storyline.
Sarah Alexander (Susan) was very ill when they filmed the scene in the hospital.
This episode was taped on August 28, 2004.
This episode marks the final regular appearance of Richard Coyle as Jeff Murdock.
The title refers to the series theme song, but also the three women's 'perhaps' pregnancies, as we see the three stories of why all might be pregnant.