Sheldon probably has a lot of advice for Raj when it comes to living with Leonard and Penny. He'll probably also encourage him to sign a roommate agreement.
Something else that could be posing a problem for Sheldon is that with Raj taking his old room, it makes it that much more permanent that he lives with Amy now.
Sheldon is dismayed to learn that Leonard and Penny have given Raj his old room on The Big Bang Theory. "The Escape Hatch Identification" is the 18th episode of the show's tenth season.
Whatever Sheldon and Amy's fight is about on "The Allowance Evaporation," it has Amy feeling pretty upset, and it looks like her feelings are hurt. Here's hoping this fight doesn't last long.
Sheldon: I'll have a diet Coke. Penny: Can you please order a cocktail? I need to practice mixing drinks. Sheldon: Fine... I'll have a virgin Cuba Libre. Penny: That's... rum and Coke without the rum. Sheldon: Yes, and would you make it diet?