Other mistake: When they're roping the mustangs, the "stallion" doesn't have the genitals of a stallion.
Continuity mistake: During the scene when Natalie Woods goes with Toots to make-out point after the dance and jumps in the water, it's supposed to be late at night. But when they cut back and forth between shots at the water falls and Warren Beatty waiting for Natalie on her porch, all the scenes at the falls were shot in broad daylight, while the ones of Warren on the porch are at night.HuskyMiller
Continuity mistake: When Carol and Jerry come out of the water on their day at the beach, they sit at the foot of their beach chairs to dry off, then lay back. Miraculously their towels are spread out over the chairs.