The documentary is about the men who claim Michael Jackson sexually abused them as children.
Rosie O'Donnell" called it "haunting."
Judd Apatow said it would "take days to recover" from the documentary.
RELATED: Michael Jackson's brothers say HBO documentary 'Leaving Neverland' neglects facts
Part one of "Leaving Neverland" aired Sunday night, and part two aired Monday night.
Jackson's estate has criticized it, calling it "character assassination," leading them to file a $100 million lawsuit.