Do you remember the scene in Superman where boy Superman uses his toys to build a model of the universe or something, much to the shock of his adoptive parents? Maybe there was not a scene like that but there should have been.
Anyway, I later realized that Evan had laid out the cans carefully on various flat packets of seasoning mix or whatever, with the stacked items aligned nicely and organized by type. I'm sure it is insignificant, but I think it means Evan is capable of a very high level of thinking for his age. On the other hand, he may just be growing up to be as anal retentive as me.