Interesting trailer if you look at the scene at two minutes forty seconds its a deleted scene which to me is fascinating.
Regarding Dukes Oscar triumph being broadcast within the trailer my theory is as follows. John Wayne did not recieve his Oscar until after "Chisum," was filmed, I believe he had to leave the set of "Rio Lobo," to pick up his Oscar. However "Chisum," was probably not released until after Duke received his Oscar thus the reason why this footage was able to be used. Its also likely that this Oscar footage was used in order to boost the appeal of "Chisum," which was a solid but not spectacular movie.
