In the scene where Penny and Beverly are drinking, the level of Beverly's drink changes twice even though she hadn't drank any.
Beverly said she and her husband hadn't had sex in eight years. However, in "The Maternal Capacitance", she stated that she and her husband only had sex to have children and that Leonard is her youngest child.
Beverly: Your "Check Engine" light is on.
Penny: Yeah, I gotta put a sticker over that.
Penny: Sheldon, what about you, did you have a Christmas tree?
Sheldon: Oh, yes. We had a tree, we had a manger, we had an inflatable Santa Claus and plastic reindeer on the front lawn. And to make things even more jolly, there were so many blinking lights on the house, they induced neighborhood-wide seizures.
Sheldon: I found the Grinch to be a relatable and engaging character, and I was really with him right up the point that he succumbed to social convention and returned the presents and saved Christmas. What a buzzkill that was.
Leonard: When we watch Frosty the Snowman, he roots for the sun.
Sheldon: Excuse me, but the sun is essential for all life on Earth. Frosty is merely a bit of frozen supernatural ephemera and a stolen hat—a crime, by the way, for which he is never brought to account.
Sheldon: I made tea.
Leonard: I don't want tea.
Sheldon: I didn't make tea for you; this is my tea.
Leonard: Then why are you telling me?
Sheldon: It's a conversation starter.
Leonard: That's a lousy conversation starter.
Sheldon: Oh, is it? We're conversing. Checkmate.
This episode's end titles has Chuck Lorre's Vanity Card #272.
The Italian episode title is "La coerenza materna", meaning "The Maternal Coherence". The French title is "La Congruence maternelle". The German title is "Mädels an der Bar", meaning "Girls at the Bar".
International Airdates: Latin America: February 9, 2010 on Warner Channel; Australia: March 15, 2010 on Channel 9; United Kingdom: May 6, 2010 on E4; Finland: November 29, 2010 on Sub; Turkey: December 13, 2010 on CNBC-e; Czech Republic: December 20, 2010 on Prima COOL; Slovakia: October 31, 2011 on Markiza
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