Character mistake: The girl Spencer dates does not speak Uzbek, she speaks Russian.
Continuity mistake: When Freddie first tests Sam's emotion with "MoodFace," IN LOVE is written in red. Later, when he shows the results to Carly, IN LOVE is written in green.
IParty with Victorious - S4-E10
Continuity mistake: When Sinjin is on the game that malfunctions, he flies out the window. Before he hits the window he's facing up; when he's about to hit the pool, he's facing down.
Continuity mistake: Carly goes up to Sam and Freddie and puts her crumpled up napkin on her table. In the next shot, the napkin is crumbled in a different way. In the shot after that, Carly sits down and her napkin is completely flat.
IBattle Chip - S6-E6
Continuity mistake: When the table of the iCarly gang falls over due to Sam's fight with the bully, Gibby's phaser falls on the floor without a scratch. Moments later you see the phaser when the bully stands up again, all messed up.
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.