Other mistake: Everytime it shows a window it is morning, even if the scene is supposed to be at night.
Other mistake: Right after the two girls have been taken in by Lucas and Annabelle, there is a scene where the girls are asleep. Lucas turns off a lamp and Annabelle turns off the overhead light switch; the room goes to complete darkness. However, when the camera pans back to the bed, there are two lamps/nightlights on in the room which would've provided light in the room even after Lucas and Annabelle turned off their lights.
Answer: I'm pretty sure that they ate cherries because of all the pits shown when the two men enter the house. They probably ate other things as well because Lily is shown eating a moth in one scene.