"Marty was very upset," Scorsese's pal Steven Spielberg explained in the clip. "I get a call at the office, and he said, 'Steve, Steve, this is Marty. Can you come over to the house? They want me to cut all the blood spurting, they want me to cut the guy who loses his hand!'"

In the first trailer for the five-part docuseries, Scorsese says that he almost bought a gun during the making of ‘Taxi Driver.’