In the final confrontation, Odd Bob has creases visible on the back of his neck, revealing the mask.
Clyde Langer claims that the house over the road from 13 Bannerman Road is 36 Bannerman Road. This contradicts Invasion of the Bane, where it was established that Maria and Alan lived at 12 Bannerman Road.
Sarah Jane admits to a life long fear of clowns, which Luke identifies as Coulrophobia, despite the fact that when Maria is looking around the attic in Invasion of the Bane (2007), a large clown is displayed next to her desk.