Continuity mistake: Spencer arrives at his destination with butter on his elbow but it disappears a few moments later.
Other mistake: When Carly and Sam are pumping the watermelon full of air, one shot zooms in on Carly's finger as she hits the on-switch. The device is turned off as she removes her finger. (00:01:32)
Continuity mistake: During Sam and Freddie's first interaction, Sam can be seen holding a coffee cup when she enters the room. For the first half of the conversation the cup is plain white, but as the camera returns to Sam, and she says, "You mean I can't play with the white balance on your super-dee duper-ee camcorder?" A green logo on the cup is plainly visible.
ILike Jake - S1-E4
Continuity mistake: The locker that Sam has is introduced here, but in episode 3, she already has that locker.
Suggested correction: That's because the episodes were aired out of order, which isn't a mistake of the show. Episode 4, "ILike Jake", was the 2nd episode produced and episode 3, "IDream of Dance", was the 13th episode produced.