2) Not a misprint; that's the character's name. He's the son of Cersei Lannister and Robert Baratheon, and so has Robert's last name. He's more closely associated with House Lannister, though, so that's why he has that affiliation here.
Thanks for explaining that
We were confused in our last game because we were collecting Baratheon's, but Joffery is in House Lannister.
But, you're right, it's absolutely accurate.