Continuity mistake: When Carly and Sam are on the web show at the beginning, Sam puts the air hose around the edge of the watermelon. When the camera cuts back to the watermelon later on, the air hose is in the center of the watermelon.
Continuity mistake: Spencer is talking to the Sunshine girls about stealing his spot. After he gets pushed in the street, when his skateboard goes flying and breaks in two, one half goes offscreen, and one goes under the table. In the next shot both halves are by his feet, but in the next shot they are back in their original positions.
Continuity mistake: When Spencer and Carly are blowing bubbles to the ceiling, when the bubbles pop, and the soap comes down, Carly's hair is all knotted and messed up. But when she sits up, her hair is perfectly parted and straight.
Continuity mistake: When Lewbert is on the ground and everyone's in the lobby, you can see that Carly's shoe doesn't have a large wart before Lewbert screams, "Where's my wart!"
Continuity mistake: There is a scene where the iCarly gang are arguing with Nevel. Sam went to beat Nevel up, which during the process made her hair messy and her headband slipped backwards. However, in the next shot her hair is not messy and her headband is perfectly normal. This keeps happening several times throughout the scene.
Continuity mistake: When Spencer first gets his Galaxy Wars thing, it doesn't show the sticker that says it is not a real prop from Galaxy Wars until Freddie tells Spencer.
Continuity mistake: Sam fights Freddie about a bikini. When he wins he throws it down. After the fight, there is a close up of him. You can see a flag in the window of the door. Then two girls walk up. In the next close up, the flag is not there.
Continuity mistake: In the beginning, Carly gets a bowl and fills it with popcorn up to about 2/3 full. The camera cuts to Sam, then back to Carly, and the bowl is barely full. The camera goes back to Sam then to Carly again, and the bowl is 2/3 full again. Freddie walks in, and the bowl is barely full again, which Carly now fills with popcorn.
Continuity mistake: When the gang is at their apartment watching the news over how they think Carly pushed Shelby's grandmother down, there is a ladder outside their door that appears and disappears from shot to shot.
Continuity mistake: When Freddie wrestles Carly to the floor, there are three shots of her lying on the floor as they argue. The first two show her head in the same spot on the floor; the third shows her head in an entirely different spot (look at the floorboards).
IQuit iCarly - S3-E8
Continuity mistake: Carly, Sam, Fleck and Dave are sitting at one table at the Groovy Smoothy sipping a new smoothy flavor with T-Bo standing next to them. Suddenly the smoothy gets too spicy so all four go to another table and gulp down other people's waters then sit back down. The waiter places two glasses in front of Dave and Fleck. The waiter starts to pass behind T-Bo with 2 more glasses of water, but the shot immediately cuts to Sam and Carly drinking water.
Continuity mistake: When Sam, Carly, and Ernie the dance coach are backstage hearing about the talent competition, his hands and clipboard move position from shot to shot.
Continuity mistake: When Ginger Fox and her manager are in her room, Ginger squats down to tell her rabbit to roll over. Her bra strap has slipped off her shoulder. When the camera pans out, her bra strap is up. The camera zooms back in to her face, and her bra strap is down again.
Continuity mistake: After Gibby is kicked into the stack of boxes, he slumps to the floor and a large sleeping bag or pillow appears beside him only to disappear in the following scene. Then when he takes off his shirt, a yellow extension cord appears on top of the boxes.
Continuity mistake: An unconscious Nora falls to the floor, her head landing squarely in the center of a white tile. But in the subsequent closeup, her head is on a grey tile.
Continuity mistake: When the iCarly gang and T-Bo rush in to set up the birthday breakfast for Carly, the balloons change positions between shots.
ISam's Mom - S4-E2
Continuity mistake: When Sam breaks into Carly's room, Carly wakes up and her hair is messy. In the next shot it is less messy and in the shot after that it is perfect. In the shots after that her hair becomes more messy.
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.
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.