4. Homer Gives Up Being Smart.
Homer realizes that the only reason he is dumb is because when he was a kid, he lodged a crayon up his nose which has been the cause of his low IQ ever since. He had the crayon removed and begins to get his intelligence back. Lisa loves her new, smart dad but Homer was not prepared for the responsibility of being smart. So, he had a crayon shoved up his nose again but before he did, he writes a beautiful letter to Lisa about how proud he is of her being so smart.
5. Father and the Bride.
In the future, Maggie is set to marry someone who does not approve of her family and he intends to cut them out of the wedding. Maggie refuses to marry him and back in the present day, she realizes how important her dad/family is to her.
6. Bleeding Gums Dies.
He is a saxophone player and Lisa admires him greatly. He helps her practice for her concert and after her great performance, she returns to find out that he has died.