Penny: What the hell is that?
Leonard: What was it doing on the ceiling?
Wolowitz: That's classified.
At the very end of the show, Leonard and Raj arrive at the hotel, which is supposed to be in Geneva, Switzerland, to visit CERN. If you look out the "hotel" window, it looks like they're half way up Matterhorn, but in Geneva there are no big/rocky mountains anywhere near the city itself. See more...
After Sheldon mentions a molecular sieve, they go over to 4a, their apartment. 4a is a kind of molecular sieve. See more...
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The entry you are marking as a duplicate is:
|Title||The Big Bang Theory|
|Original entry||When everybody is on their laptops at the beginning of the episode, you can clearly see in many shots that their screens are black.|