U.S. Air Force commissioned officers do not, and did not, wear silver chinstraps on their service caps. The POW escort officers are shown with silver chinstraps on their service caps. This is a mistake.
In the movie, the Son Tay Raid and the death of Ho Chi Minh occur at just about the same time, but in fact happened 14 months apart with the death of Ho in September 1969 and the raid in November 1970.
In an "interview" Major Nogo Doc introduces Hubman to Major Ngiap,
Nogo Doc asks Hubman about the radar on his aircraft, which he calls an "A6." But he describes the two place tandem cockpit layout of an F4 Phantom II. The two-place cockpit layout of an A6 Intruder is side-by-side, not tandem.
A Russian and a Cuban officer are shown arriving at the prison to help interrogate prisoners. No American POW held at the Hanoi Hilton was ever questioned by such officers.
Hubman is questioned about the A6 Intruder aircraft which he supposedly flew. However, Hubman was Air Force and the A6 was only operated by the U.S. Navy.
When Williamson is shot down, his wounded crew member is shot and killed by the VC that appeared. In reality, he would have been taken prisoner as well. VC and NVA units took as many Americans prisoner as possible.
Despite the POWs being on limited rations, none of them seem to lose any weight, and they seem relatively healthy despite the lack of medical care.