The game of "Rock Paper Scissors Lizard Spock" was invented by a software engineer named Sam Kass, who outlined the rules and hand gestures on his website in 1998. He, however, called it "Rock Paper Scissors Spock Lizard".
Sheldon mentions the TV series Star Wars: The Clone Wars (2008). Frequent guest star Brian George, who plays Raj's father, voiced several characters on that show.
This episode was watched by 9.76 million people with a rating of 3.8 (adults 18-49).
Sara Rue once guest starred as teenage Roseanne Harris (Connor) in season 5 of Roseanne (1988), Halloween IV (1992). She portrayed Roseanne dressed as "Ginger if they didn't find the Island." Season 5 was Johnny Galecki's first season as a regular cast member, although he did not appear in that episode.