I was a projectionist at the Atlantic Theatre in Atlantic, Iowa all through high school. Here is an uncharacteristicaly long line at the theatre in February of 1971. The movie showing,  Cold Turkey, was filmed in Greenfield Iowa, about 40 miles away from Atlantic. People drove there to watch the movie being made, and some townsfolk got picked to be extras, so it was a very popular film in town. I liked it.