During the scene in the restaurant after Sam takes a bite of the lasagna and starts talking with her mouth full there is a piece of lasagna stuck to her chin. When she turns around to talk to Carly less than a second later the lasagne is gone.
During Sam and Freddie's date in Pini's restaurant, after Carly sits down with them she empties all the Parmesan out of a fly made of metal and glass then sets it down beside her, right way up - then while she is talking the fly is suddenly on its side, then disappears altogether, then as Carly stands up to walk away it reappears.
In the iCarly Studio scene, Sam's remote necklace can be plainly seen outside her shirt until they cut to Freddie when he mentions brushing her hair. In the next cut, her remote necklace gets mysteriously tucked under her shirt.