 In the original draft for Vegas Vacation, the Griswolds do not stay  at the Mirage Hotel. They stay at the Walley World Hotel and Casino,  and Roy Walley was a part of the script. This is a reference to the  Griswolds vacation destination from the first film.  The Griswolds house is located on the same block as the Murtaugh  House from the Lethal Weapon movies.