Homer concludes that the initials "HRH" on Her Royal Highness' bag actually stand for "Henrietta R. Hippo," a character in the children's television show.
Bart and Lisa get high on British candy and run around the UK similar to Renton, Spud and Sick Boy at the beginning of Trainspotting. Also, Maggie crawls the ceiling and twists her head 360 degrees, spoofing Renton's reaction to going cold turkey.