Jerry eventually realized, that doing the right thing is quite difficult and sometimes those acts can't even bring a pleasure or make someone feel good right away. In other words, sometimes right things can come across as wrong things.
Jerry learns to not be selfish. In the beginning it was his fathers birthday. He was excited to get some baseball cards and Armand was angry with Jerry's selfishness. Sometimes you learn you cannot get everything your way and you have to learn to mature as you grow.
