In the attack to relieve beleaguered USMC units, the Battle of Chosin Reservoir, the aircraft have a randomly variable number of rockets under their wings. In particular, an aircraft is seen with no rockets, then fires two rockets, then has two rockets left as it flies away...
For winter flying in Korea pilots would have been dressed in "Poopy Suits", heavy, bulky, rubberized anti-exposure suits which were decidedly unglamorous.
The Corsairs are seen to shoot down a Mig 15. Whilst a Mig 15 was shot down by a Corsair in Korea, it wasn't until later in the war and not by Jesse Brown and Tom Hudner.
During WW2, the Corsair was originally only used by USMC shore based squadrons and not cleared for carrier deck landings as the US Navy pilots couldn't land on deck safely until they adopted the British Royal Navy technique of a curved approach towards the end of WW2 in Dec 1944. By 1950, when this film was set, a curved approach would always be used and so the long nose of the Corsair would have not been a problem.
The problem affecting Corsairs where the port wing would stall when power was applied too quickly resulting in it flipping over only affected the prototypes and early pre-production models. By the time that it went into service, an anti-stall strip had been fitted to the port wing so that both wings would stall at the same time and not exhibit the characteristics shown in the film.
When Brown's aircraft is hit by small arms fire and starts trailing vapour, he claims it to be oil and the engine is seen to be experiencing high oil temperatures and low pressures. After the engine seizes up, it is still trailing vapour. In reality, the vapour trail would stop as the oil ran out, then the engine would stop as it lost lubrication shortly after.
When the Corsairs came in for landing on the aircraft carriers, they approached the deck straight in. But, because of the length of the Corsair's nose, by approaching the carrier head on like this, the aircraft's nose would have obstructed the pilot's view of the deck, and the pilot would not be able to see the deck, to see if their approach was too high or even too low. Instead, when Corsairs would approach a carrier, they came in on a 90-degree angle so that they could see, off to their side, the deck. Then, as they neared the carrier, they would make a 90 degree turn right onto the deck, almost immediately after having made that turn. In this way, they could keep their eyes on the deck almost all the way on their approach. Otherwise, the pilot would have been, figuratively speaking, flying blind.
The anti-aircraft gunfire shows many small airbursts. The small anti aircraft guns use by the North Koreans did not have an airburst fuse for their ammunition, this would have been for the larger caliber guns.
While on shore leave in the Mediterranean a street is lined with various flags. The Greek flag shown is one not adopted until the 1970s (blue cross in the canton with blue and white stripes). At the time of the Korean War the Greek flag had a blue field divided into quarters by a white cross and had a crown in the middle of the cross. This was the flag of the Kingdom of Greece and was used from 1935 until 1970.
During the raid, one pilot says that he has "a mechanical issue with my landing gear." The misuse of 'issue' to mean problem did not begin until the 1980s, largely influenced by computer companies not wanting to recognize problems as such.
In 1950 the waters between Japan and the Korean Peninsula was (and actually still is) called the Sea of Japan. In Sept 2022 the US Navy used the term "East Sea" but quickly retracted it. By the way, China and Russia call these waters the "Sea of Japan" a name that was placed by Europeans in the 18th century.
Many of the Corsairs are seen to be equipped with the WW2 era 6 x .50 calibre machine gun armament rather than the Korean War era 4 x 20mm cannons.
While the Naval Aviators were wearing dress uniforms on shore leave in France, the Marine Officers were wearing their BRAVO uniforms, tie only no blouse (jacket). In reality, they would have been in the more formal service ALPHA uniform.