Trivia: There is an establishing shot of downtown Seattle about 10 minutes into the movie. It's an old shot; the Kingdome - which was imploded nearly 11 years ago - is visible in the background.
IParty with Victorious - S4-E10
Trivia: When they're at the party, the song in the background, which I think is called The Joke Is On You, is the same song during the montage during "IGet Pranky."
IGet Pranky - S4-E3
Trivia: When Carly is watching TV, you can hear the TV playing a clip from "Drake and Josh" where Megan is pulling a prank. Carly says "Why can't I pull pranks like her" or something like that. Carly and Megan are both the same actress, Miranda Cosgrove.
Chosen answer: I don't know how to answer the first question but for your second question, there is going to be an episode after iPWV, called IDate Sam & Freddie which will deal with their kiss from iOMG. IParty with Victorious will not be related to IDate Sam & Freddie.
The I date Sam and Freddie proves that they are a couple.