Franco uploaded the preview online at the beginning of the month, but it started getting passed around Monday.
“Tar” blends adaptations of 11 of Williams’ poems to piece together his life from early childhood in the ’40s to fatherhood in the early ’80s. Franco plays the poet, while Chastain plays his mother, Kunis his wife and Braff his friend.
The star-studded film premiered at the Rome Film Festival last fall, yet still does not have a U.S. release date.
Franco also stars alongside Kunis in Paul Haggis’ romantic drama “Third Person,” which premiered earlier this year at the Toronto International Film Festival and has been acquired by Sony Pictures Classics.