Visible crew/equipment: During the initial phase of the final assault, a row of men with their backs to the camera is shown. One of these men (right of the center, with a bandaged head) is actually a dummy positioned at the spot where the wall is blasted a few seconds later. (02:29:35)
Visible crew/equipment: In the background just before the final battle a number of modern day trucks can be seen on the hills.
Visible crew/equipment: During the battle scene, you can see stuntmen falling on mattresses. Just after Crockett tells his men to take Bowie into the chapel, someone actually falls off of a wall and bounces.
Answer: No, that's not him. Robert Mitchum has no part in this movie.
Mortug