I actually find it harder to act in the scenes where there's not much happening, say having a milkshake in the diner. That is far harder to do than straight scenes where there's a drama going on and you have something to do. ↗
Also, there are seats in the diner that always fall off the table. If you have a scene where you're packing up at the end of the day and putting them on the table, they just slide off. ↗