Revealing mistake: In the scene were Charlton Heston has just said goodbye to Sophia Loren and is about to ride off with his followers (last scene just before the set intermission in the film), you can just make out a tiny little red automobile riding through the landscape in the background.
Revealing mistake: In the shots taken from above, on the scene where Mallory and Stavros are climbing the cliff under hard rain, the rain falls over the back of them, not over his head. Reveals that this scene was taken in horizontal position over the floor. Not taken in vertical position.