Bradley Walsh (Spellman) later played Graham O'Brien during the Jodie Whittaker phase of Doctor Who (2005).
When the clown is handing out tickets, Steve calls him "Krusty," the clown character on The Simpsons (1989).
Director Michael Kerrigan is a previous member of the "Russell T. Davies Family" having already directed Battlefield: Part One (1989), one of the last of classic Doctor Who serials.