A small Cessna carrying Shields and Belushi ran into a parked SUV on Friday afternoon.
After landing the plane, the pilot left the aircraft without securing the brakes, San Luis Obispo, California sheriff's officials told PEOPLE.
The Cessna 421B had touched down at a private airstrip at Hearst Castle in San Simeon, California, where Shields, Belushi and others on the plane were attending a private function, said sheriff's spokesman Rob Bryn.
"The pilot got out, but he forgot to set the parking brake," Bryn said.
The plane rolled a few feet into a parked rental SUV, breaking its side view mirror and scraping the side of the vehicle, but no injuries were reported, said Bryn.