On David Kemper's previous series, Pacific Blue, Darlene Vogel played the daughter of a character played by Kent McCord, who plays Jack Chrichton on Farscape.
Max Phipps who played Tuzak appeared in the Mission: Impossible TV series filmed in Australia in 1988. He died in 2000.
Aaron Cash, who portrayed Pa'u Bitaal, would return as Dregon Carzenonva in the "Look at the Princess" trilogy.
The painting in the archway of the Delvian Temple is based on "The Old Glen Mill", a painting by Maxfield Parrish.
In an internet chat, Ben Browder promised that the question of weather Crichton wore boxers or briefs would be answered in this episode, although he claimed that he thought Crichton should "go commando" (sans underwear).
"Rhapsody in Blue" was a very intense episode for the makeup crew. Eight artists were needed to create all the Delvians seen in this episode.
Despite occasional discussions, Farscape never returned to Deliva, making "Rhapsody in Blue" the most in-depth examination of the race.
D'Argo: Something Crichton said is disturbing me.
Rygel: Finally! I've been saying that since he arrived.
D'Argo: It's what he said about us all having the same dream.
Rygel: It wasn't the same. Mine was better than yours.
John: (seeing Aeryn in his boxers) Hey, that's my underwear.
Aeryn: (pulling the back of the boxer to reveal the label) What does this say?
Aeryn: Then it's not yours.
John: I'm not a Peacekeeper.
Tuzak: Yes you are. I am insane.
John: Yeah, that would've been my next guess.
John: What is that?
John: It's like Disney on acid! Ten years of really great sex all at the same moment.
Aeryn: It amazes me how people mistake theosophy for superiority.
John: You know, I don't think so, Aeryn. I don't think anything amazes you.