When the gang is onstage at the Jimmy Fallon show preparing to dance, the guitarist's instrument randomly changes from a red Gibson ES 355 to a maroon Gibson Les Paul custom.
Sam presses the front of the Screaming Mel doll's chest to activate the doll's voice. Jimmy Fallon presses the back of the doll to activate the doll's voice.
This episode centers around the idea that one of the characters exposed themselves on TV and now they are being fined by the fictitious NCC (FCC)
There are two reasons this could not be true, at one point Jimmy Fallon says "that's live TV for ya", but the Late Night with Jimmy Fallon show was recorded at 5:30 in the afternoon, and was not a live show. Therefore the exposure could never have happened. And the FCC/NCC does not fine individuals in a case like this it would fine the show.
After the ICarly gang get out of the taxi in New York City, based on the way they are handled, the suitcases are obviously empty.
Gibby's pants fall down because earlier the street seller does not have a belt to sell him. But, Gibby is already wearing a belt when he is talking with the street seller.