Other film work includes "Butch Cassidy and the Sundance Kid" (1969), "Mackenna's Gold" (1969), "The Limit" (1972), "Charcoal Black" (1972), "The Slams" (1973), "Thunder County" (1974), "Poor Pretty Eddie" (1975), "Harry and Walter Go to New York" (1976), "The Last Remake of Beau Geste" (1977) and "Goin' Coconuts" (1978). Alongside Michael Werner, he co-wrote the screenplay of 1973's "The Harrad Experiment", in which he made a brief appearance. During that time, he also worked with Noel Marshall, the executive producer of "Harrad Experiment", on the adventure-comedy film "Roar" (released two years after his death).