Christine Baranski received an Emmy nomination for her performance as Leonard's icy mother in this episode.
With 13.11 million viewers, this show was the most watched of the second season.
At the beginning of the episode, the song Sheldon, Raj, and Howard are playing in "Rock Band" is "Under the Bridge" by the Red Hot Chili Peppers.
As Penny and Leonard's mom are going down the stairs at the end of the episode, Penny mentions her father's name being Bob. When her father comes to visit in a later episode, his name is Wyatt.