The way I understand it, Wanda gave them those cards. But he said “Nice haircut” at the front door, before he went further into the house and saw the cards.
The correct spelling is “alias”, not alies. (My spell-check just confirmed that fact.) So the plural is “aliases”. I don’t know if that was intended to be Hammie’s misspelling, or if the cartoonists were making that mistake.
I guess they meant to say “six months left”. Also, here in New York City, school was ten months long. All months except July and August. As far as I know, it is still that way.
I’m totally unsure also what it supposed to be.