I seen this movie at Stony Brook College Theater in 1970.

"Alice's Restaurant is a 1969 American comedy film co-written and directed by Arthur Penn. It is an adaptation of the 1967 folk song of the same name by singer and songwriter Arlo Guthrie. The film stars Guthrie as himself, with Pat Quinn as Alice Brock and James Broderick as Ray Brock. Contrary to popular belief, while Arlo Guthrie wrote the lyrics and music for the narrative song Alice's Restaurant Massacree, he neither wrote nor co-wrote the screenplay for the film Alice's Restaurant, which was instead co-written by Venable Herndon and Arthur Penn. Alice's Restaurant was released on August 19, 1969, a few days after Guthrie appeared at the Woodstock Festival."