At one point Crichton yells at the intruder to get off the ship in Klingon. Ben Browder saw the actors in their make up and asked Richard Manning, one of the producers, for some Klingon. He told the director he would be yelling the line in Klingon. He didn't tell Raelee Hill, so that was her real reaction when he yelled out the line.
At the end of the episode, when Crichton is writing his equations anew, he writes "A+C=B" (Aeryn plus Crichton equals Baby).
Won't Get Fooled Again (2000), "Crichton Kicks" and What Was Lost: Part 1 - Sacrifice (2002) and What Was Lost: Part 2 - Resurrection (2002) are the only series episodes with no scenes on board either Moya or Talyn.
First appearances of Sikozu and 1812.
The DRD named "1812" refers to the 1812 Overture by Pyotr Ilyich Tchaikovsky. It's the tune the DRD is playing that Crichton is singing and dancing to in the beginning and the Classical piece played towards the end.