Revealing mistake: During the scenes involving heavy rocks and boulders rolling, crashing, smashing, launching, etc, it is obvious they are made of lightweight material due to their bouncing off each other, the actors, the sand, etc.
Masada (1981)
1 revealing mistake in show generally - chronological order
Starring: Peter O'Toole, Barbara Carrera, Peter Strauss, Alan Feinstein
Factual error: The Essenes climb Masada bearing the scrolls. Just as Joseph Wiseman is framed solo, a black SUV drives from left-to-right below him on the road.
Cornelius Flavius Silva: A victory? What have we won? We've won a rock in the middle of a wasteland, on the shores of a poisoned sea.