That is a great point! I know for sure there is a 5th floor due to the episode where the blonde girl moves in and makes the guys do everything for her. And I don't remember seeing a mailbox for the 5th floor. As far as I know, there is no 6th floor. Just the roof.

TBBTKripke my bad, I recalled the episode that Leonard and Penny tried to win the president of the tenants association and went upstairs to persuade their neighbors, somehow my memory tells me they have visited the sixth floor... but you are right

If your talking about Raj talking in front of Penny without being drunk, I believe I explained why its a character error. Could you be more specific if your still confused?

@@TBBTKripke because it was a scripted scene not a mistake. The joke was that he was so interested in zod that he just forget about his phobia.

If that were true, I think there should have been more of a mention by Penny or someone being shocked that he spoke in front of Penny then sweeping it under the rug. If you look at the expression of Penny and the way she turned her head kinda gave me the impression it was a actor mistake rather then scripted. Remember when Raj spoke when he started sipping his first Grasshopper drink? Penny was not only shocked but she said, "OMG, your talking to me!" Why didn't she in this scene? Its out of character of Penny. It is a shocking bit of revelation for Raj that Penny would need to talk about? So I think it was an actor mistake and kept the scene going. Can you can show me proof from someone who worked on the show who specifically said it was scripted as you say? If you can, I'll fix the mistake on my end and give you credit.