When Matt and Lanny enter the kitchen area with handfuls of items (just after Mrs. McGuire found Matt's gambling book) in one shot Lanny puts down his handful of items on the table they are standing in front of. But two shots later all the items are back in his hands and he puts it all down again before running away.
When Lizzie's Mum brings over her brown paper bagged lunch to her at breakfast, she places it on the counter beside her. In the next shot it has gone and the reappears in the next shot.
When Gordo is talking to Lizzie and Miranda and then walks off (and Lizzie then says "I think he just broke up with us") the position of the blue handled fork on Lizzie's plate keeps changing.
At the start of the episode when Miranda and Lizzie buy drinks (before spotting Gordo with Brooke) the cups are clearly empty.