Hanson vs Carlson vs Dave

Looking at the cast list and the Trivia page before seeing the actual film...

Okay, we had Jeff Carlson playing Jeff Hanson, Steve Carlson playing Steve Hanson, and David Hanson playing Jack Hanson, yet David was originally supposed to play a character named Dave "Killer" Carlson (which went to Jerry Houser).

So, Jeff & Steve got to keep their real first names while Dave had to change his first name to play the brother of two characters who were using his real last name, and Jerry Houser got Dave's real first name and Jeff & Steve's real last name.

Pardon me while my head explodes!