I have not seen the "the Passion". I don't need the cinema to explain to me the torture.
He followed "supplemental material" that was well accepted in the Roman Catholic church. Evangelicals view most of this stuff as speculative at best.
I ask respectfully, How do you know, since you say you would "never watch" the film? I saw it, I'm also familiar with the Gospels, and I'm not aware of the falsehoods you refer to. Could you be more specific?