When Amy is talking to Cheyenne in the cafeteria, her fork is empty at the angle change. It then has a slice of apple on it, which then disappears from the rest of the scene without her eating it.
It was implied that having a green card means that someone is a US citizen. A green card only means that someone is a permanent resident, not a US citizen.
During the stores Olympic Opening Jonah is carrying a Breville coffee maker. It is heavy, but he is holding it like it weighs nothing. More than likely it was just the box that Ben Feldman was holding and not the actual item.