Robert Downey Jr. buried the clothes that he wore in 1987’s “Less Than Zero” in the backyard of his house in a symbolic attempt to bury his decadent 1980s Brat Pack image and begin a new phase of his life and career after filming Chaplin.
When Robert Downey Jr. was on the set of the Avengers he would hide food on the sets. Nobody was ever able to find it so they let him continue to do it. The scene where he is eating blueberries is unscripted and part of the collection of food that he hid.