We do get to see a little bit of everyone in this episode. Every one played their typical characters- not trying to veer into alternative roles. We see Sheldon at his annoying self trying to make Penny miserable with his scientific jargon infused talk. Raj again proves that he needs alcohol to speak with women. Howard shamelessly hits on women way beyond his league. And, Leonard with his classic sarcastic attitude.
We see Summer Glau making sort of an Cameo here, and we also see the actual Nobel prize winner George Smooth who asks Sheldon, if he is on crack. I don't watch Sarah Connor Chronicles-whatever - so I don't really know how important Summer Glau is on TV. But here, she played a unimpressive role. The episode was good in the sense, we had a fair share of good lines, and some classic Sheldon Vs. Penny stuff.