The design of the Cat's pink suit from the first series was copied from an old black suit belonging to Danny John-Jules' father, who got married in it. John-Jules brought it in after deciding none of the designs provided were really appropriate for the character.
Robert Llewellyn uses a Canadian accent to play Kryten. He considered using a Swedish or American accent before settling on Canadian. Llewellyn discovered the accent while spending time in Vancouver, British Columbia; which he describes as being a cross between Scottish and American.
Originally, Holly was supposed to be a voiceover character. But Norman Lovett protested and insisted on being shown on camera. Holly was changed to a disembodied head on a computer screen. Shots of Lovett were added to already completed scenes in the first series.
Production on the seventh series was delayed for three years. In 1994, Craig Charles was arrested on a rape charge and held in prison. Rob Grant decided to end his partnership with Doug Naylor and leave the series. Chris Barrie was busy starring in The Brittas Empire (1991). Charles was later acquitted, Naylor hired new writers, and Barrie was convinced to return to the series.