One police officer called it "the most unusual incident I’ve seen."
Dozens more were injured, with some bleeding on the highway.
At least 15 states in the past five years have considered legalizing lane-splitting for motorcyclists, but only California has enacted legislation to do so.
The cast and crew members are fine, with some recovering from minor injuries.
Here are the accidents and injuries caused by the statewide false alarm.
There was no indication that the incident was deliberate.
"He's gone [and] he's never coming back," a relative said.
Santa Claus made the arrest.
Jerome Barson, 78, who was a passenger in a sedan that collided with the SUV Williams was driving, died 13 days after the June 9 accident.
The fiery collision killed a mother, father and teenage son.