When Devi and Eleanor talk in the cafeteria, as Eleanor first picks up the apple, the previous bites are already oxidized from sitting out (probably during previous takes), but after the 'rage eat' comment from Devi, the apple is seen on the table with several fresh, un-discoloured bites taken out, indicating that shot either from an earlier take, or it's a new apple.
As Ben ends his conversation with Devi in the hallway, he slams his locker and walks away. The lockers have always been shown to be secured with standard combination Master-Locks, which need to have the shackles manually engaged. So, his 'slam and leave' means his 'locker' is not locked at all.