This episode contains flashbacks featuring the Third and Fourth Doctors as played by Jon Pertwee and Tom Baker respectively. The clips shown include bits from the episodes The Time Warrior and The Planet of the Spiders (both from season 11 - Jon Pertwee as the Doctor), The Hand of Fear (Season 14 - Tom Baker as the Doctor) and The Five Doctors (Season 20 - Peter Davison, Patrick Troughton, Richard Hurndall/William Hartnell and Jon Pertwee as the Doctors).
Samuel Lloyd was born on June 23, 1994.
In 2001, Samuel Lloyd's parents were killed in a car accident.