At approximately 21 minutes, Aaron is having a soda at Billy's house. There is a plate with bread and a cherry pie on the counter behind him. They disappear and reappear from scene to scene for the next minute or so.
When Aaron and Lester break into the hotel room to find a dress for Aaron to wear in graduation, Lester picks the door lock with a single pocket knife. However no locks can be opened with a single instrument, he should have had at least a wrench too.
Aaron's father's car's plate number is 415138. Though his father was out of town with his car for a very long time we saw the same car/plate just outside the house where the party is given after the graduation ceremony. That car can't be there at that moment.
In 1933 Aaron gets the letter for his father marked as from "Works Progress Administration".
Works Progress Administration was only established in 1935.