User blog comment:Sockstar1/iCarly Filming Timeline/@comment-3174012-20110614083615/@comment-2032682-20110614100059

Yes, that article was the one with the cute nerd in it.

We know it's filmed second because Nick is calling the episode iLose My Mind. Based on casting information iLose My Mind is at a mental hospital, and that stuff was all filmed in the second week.

In the promo there is stuff from iDate Sam and Freddie which was all filmed in the first week.

The only logical explanations are: iDS&F plus iLose My Mind = A two-part first episode named iLose My Mind. or iLose My Mind as the first episode then iDate Sam and Freddie as the second.