Corman financed the picture, serving as the film's uncredited executive producer. The budget was $75,000. Shooting began on April 15, 1965, with a production crew consisting of only seven individuals. During the first two days of the production, actual shooting was extremely limited due to near-constant rain, which caused severe flooding in the areas where they had planned to shoot. Hellman estimated that $5,000 of the already small budget was eaten up by the wasted time. Another $10,000 of the budget were for the horse wranglers' salaries, the only union element of the film, apart from the actors. Corman's deal with Hellman and Nicholson was that if the film went over budget, any additional costs would come out of their own pockets. Despite the initial problems, the film was completed for the original budget estimate.