Dennis was the no.2 pilot on set flying an AH-6 in the footage you see in the film. Bob Z? was lead. If you skip straight through to 25:40 in this
interview Dennis talks about it and shares two quick stories from the filming. I get the impression he still has a bunch more stories about it.
If you enjoy his flying and want to offer anything back - Dennis manages a pilot scholarship in the UK and would welcome any support for that. "So you think you can fly" reality TV series with Dennis as one of the judges... would be awesome!