In the hangar, the P-40 has a nose number of 41A. After the landing, the number changes to A14. The font is such that it can't just be a reverse-angle video turning the numbers around.
When the Chinese pilot chases the Japanese Zero that had attacked the airfield, the Soviet made I-16 holds its own in combat with the Zero, staying with the Zero as it climbs and accelerates, and maneuvering on an equal level. In real life, the Zero outperformed the I-16 in every way, and the Japanese pilots were far better trained. Zeros claimed almost 300 I-16s shot down over China, whereas no Zeros were lost in air combat.
The film shows Japanese Zero fighter planes dropping bombs on Chongqing. The fighters' primary mission was escorting the bombers. Carrying bombs would have limited their range. Zero's were still used in tactical bombing runs provided they had the fuel to make the flight to and from.
The damaged P40 flies at the same speed as a jeep for what seems to be miles before it sets down on top of a vehicle. A fighter plane that traveled that slowly for that long would stall and crash.
As Jack is briefing and introducing himself to the new recruits at the airbase. At the end as he walks away he gives the order "At Ease", however they have already been standing 'At Ease' the entire time. Their hands behind their back left hand cupping the right hand at the small of the back is the stance of 'At ease'. Normally it's at the discretion of the commander or senior officer addressing them to be at attention or at ease, the first being the proper and most common.
A Polikarpov I-16 is shown being hit in the wingtip and the wingtip bursting into flames. There is nothing in the wingtip of a Polikarpov I-16 that is flammable and would cause the aeroplane to be shot down if hit.
The Japanese bomber pilot says to open bomb bay doors. Shots of the plane's exterior show bombs attached directly to the fuselage and no bomb bay doors to open. The Japanese bombers have internal bomb bays which needed to be opened and bombs carried externally.
The Chinese pilots fight Japanese A6M Zeros, which entered into service in 1940. The movie's publicity says it takes place in 1943.
The Japanese officers' uniforms are flashy olive instead of khaki, and almost bright turquoise instead of navy.
The aircraft presented as a P-40 bears almost no resemblance to a P-40. P-40's have 6 Browning M2 .50 Caliber Machine Guns, 3 per wing. the P-40 in the Hanger had 2 guns per wing and resembled Hispano 20mm Auto-cannons rather than M2 Browning Machine Guns, additionally were much shorter in protrusion from the wings. It is close, but with the incorrect number of guns and among various other errors, is not a P-40 Warhawk.
The strikes from rounds hitting the ground and other objects - especially from the Zero's Type 99-1 20mm cannon - should be much larger.