 During the filming of the Polymorph morphing into Lister's boxer shorts scene the audience laughed so loud for so long that Chris Barrie had to wait several minutes until things had calmed down (the scene is now considered by many to be one of the funniest of the entire series).This also provided extra work in the editing room as the sequence required more work than usual to edit together a workable shot.The episode also had some of the show's most effects intensive scenes done yet.