This episode aired in the week following North America's largest Doctor Who convention, Gallifrey One. It's unknown if this was intentional. However, the second episode following was set on Thanksgiving, so it may just be a nice coincidence due to the delayed run of the season.
At the Inspector Spacetime convention one female is wearing a gold pagoda headpiece and a gold and green bathing suit. That costume is an exact copy of a Darling Mermaid Darlings outfit from the TV show Pushing Daisies.
Tricia Helfer plays a fan at the inspecta-con. She is famous for her role in "Battlestar Galactica". As such she has participated at several comic-con events where she had many fans wanting her autograph.