The jewelry store in this episode is named Frank and Sons. Frank and Sons is a giant comic book, toy and collectibles market open on Wednesdays and Saturdays in the City of Industry, just outside Los Angeles.
A prominent color in this episode is purple. Most in different scenes: Bernadette's and Howard's magic show vests; Raj's shirt, Leonard's sweat shirt, The Donkey Kong Jenga game pieces, Penny's sweater.
In a conversation between Sheldon and Howard, Sheldon mentions that Nathan Fillion could be cast as Green Lantern instead Ryan Reynolds.
More than a decade later,James Gunn casts Nathan Fillion to play Guy Gardner _another character, but still a Green Lantern.