I noticed that, too.
It was good to see Raj get some prime time. I really liked the calls he would make to his parents. I don't think their divorce has helped the show any. They, and Will Wheaton would be best candidates for increased screen time rather than introducing someone new. Perhaps the guys can go back to the Cheesecake Factory on Boyz Nite Out and Raj can meet a hot waitress there.
Yeah, the Sheldon 'not understanding boundaries' is a bit repetitive, but that is how dealing with some folks on the spectrum is.
The chart was a great idea and showed a way in which Sheldon uses familiar tools to solve new problems.
The only thing wrong with this episode was the folks in 4a and 4b living in the wrong apartments.