When Heath Barkley's back is whipped inside the encampment of the religious sect, there seem to be no scars visible from the previous two floggings he suffered in the past 15 months, once in Legend of a General: Part 1 (1966) and again in The Iron Box (1966)
The lake scenes were filmed at Franklin Canyon Park outside of Santa Monica, CA. In at least one shot, the public restrooms for the park are visible in the distance.