Rating: 8.68 million
The title ("The Pancake Batter Anomaly") refers to the fact that Leonard found out that the cup he uses to mix pancake batter is the same as the cup Sheldon uses to measure his fluid intake and urine output.
This episode reveals that Sheldon has an IQ of 187 which makes Leonard's IQ 173 because it was revealed earlier that their combined IQs are 360.
This episode marks the first "appearance" of the song "Soft Kitty", which Penny sings to Sheldon when he is sick.
We see Howard's bedroom for the first time in this episode.
Howard reveals that he's 26 years old.
Penny: Why didn't you just have soup at home?
Sheldon: Penny, I have an IQ of 187. Don't you imagine that if were a way for me to have had soup at home, I would've thought of it?
Penny: You can have soup delivered.
Sheldon: I did not think of that.
Sheldon: It must be humbling to suck on so many different levels.
(Penny is talking with Leonard over the phone when Sheldon won't leave the Cheesecake Factory.)
Penny: He says he's afraid he'll pass out on the bus and someone will harvest his organs.
Cheryl: Homeless, crazy guy at table three.
Penny: (notices that it's Sheldon) No, just crazy.
Leonard says that Sheldon has been labeling everything in their apartment, including the label maker, but just a few moments later, we can see the full apartment and not even a single label is visible...
When Sheldon finds out he is sick, he walks towards the apartment livingroom with a comforter. He loses the comforter right before the lower level into the livingroom, but only a few parts of the comforter reaches the floor on the lower level. However, when the camera angle changes after a few seconds, half the comforter is suddenly on the lower level, without Sheldon moving it.
Visual: Leonard and Sheldon are playing 3D Chess.
3D Chess (also known as "Three-dimensional chess") is an example of a Chess variation. It has existed since the 19th century and one of the oldest versions in 3D is "Space Chess", that has existed since 1907. Be aware, concerning chess, 3D does NOT mean a chess software with 3D rendering!
Sheldon: Perhaps three-dimensional Candy Land would be more your speed.
Candy Land (also known as "Candyland") is a very simple racing board game. It is among the very first games ever played by American children, as it requires no reading, no remembering of rules and no special skills besides recognizing colors.
Leonard: You'd better go before he starts spraying you with Lysol.
Lysol is a brand name of disinfectant household cleaners distributed by Reckitt Benckiser. The use of Lysol is meant to clean, disinfect food surfaces and removing odors. The name comes from a combination using the words "lysosome" and "solvent".
Howard: But there's a Planet of the Apes marathon at the Nuart today.
Howard is referring to the Planet of the Apes franchise, but when Leonard responds, he says "Five movie, two hours a piece", and there are six movies in the movie franchise, so we can't really be sure what the guys are actually referring to beyond the franchise.
Rajesh: How about LASEK?
LASEK (shortened for Laser-Assisted Sub-Epithelial Keratectomy) is a laser eye surgery procedure intended for the use of correcting a person's vision, which reduces the need of glasses or contact lenses. The first LASEK was done in 1996 by Dimitri Azar, an ophthalmologist and refractive surgeon.
Sheldon: VapoRub makes my hands smell funny.
VapoRub is a line of medications owned by the American company Procter & Gamble. It is applied to the chest and the use of the medication is for treating minor medical conditions and the common cold.