When the Evil Alien Overlord Ian Nolan appears on the Starship's Viewscreen, the music playing is "Mars" from Holst's Planet Suite.
Ben Miller & Emma Pierson also worked on episode 2.4, Death in the Clinic (2013), of Death in Paradise (2011) as DI Richard Poole & Anna Jones, and The Worst Week of My Life (2004) as Howard Steel & Sophie Cook respectively.
The Guy Turning into a Bug is wearing a "St Neot's Choir Camp" T-Shirt.