The scene where Sheldon (Jim Parsons) tries to befriend the little girl in the bookshop is used in a training film by London's Metropolitan Police. It is designed to show how people with social disabilities can sometimes be unintentionally inappropriate.
Leonard (Johnny Galecki) reminds Sheldon (Jim Parsons) of the time he tried to learn how to swim by reading about it on the Internet. This is likely a reference to physicist Theodor Kaluza who reportedly learned how to swim by reading about it in a book. Unlike Sheldon, however, he supposedly actually went in the water and succeeded in swimming immediately.
The line "Yeah, he's a ginormous knob" spoken by Raj (Kunal Nayyar) in the pre-credit sequence is cut when broadcast by E4 in the UK.
The "big-balled raccoon" Howard (Simon Helberg) drew on his Sheldon (Jim Parsons) trivia sheet is a Bake-Danuki.
This episode was watched by 11.10 million people with a rating of 4.0 (adults 18-49).