When the 2 Germans who were dress as Americans took the jeep, it was an M38 Jeep, but in the next scene it became a Willy's.
During the battle at the end, a US soldier fires a mortar at a jeep. It lands at the front, but the explosion is at the rear.
The registration plates on German vehicles are wrong. They would have had the prefix of WH for Wehrmacht vehicles or SS runes for those registered to the SS.
The U.S. Colonel is shown wearing his rank on both sides of his collar. In the U.S. Army, the officers second lieutenant to full bird Colonels would wear the rank on the right side of the collar and the branch indication on the left side of the collar. So the U.S. Colonel should have been wearing the infantry pin on the left side of his collar.
The rank insignia worn by SS Major Klaus Kessler is that of Brigadeführer (Brigadier General) which was used on SS uniforms between 1940 and 1942, not that of Sturmbannführer (Major). The storyline is set during Operation Market Garden which was in 1944. Also because Kessler was an SS officer, the proper manner to which he would be addressed is "Herr Sturmbannführer", not "Herr Major".
Takeoff scenes with glider being towed shows a proper Brit Lancaster towing the proper Brit glider. In-air scenes are of the glider being towed by Yank Dakota C-47. And they are instructed to "take a new heading of southeast at 279 degrees." 279 degrees is the reciprocal of southeast and is actually the direction of north northwest.
Col. Colt appears to be wearing the gold leaf of a U.S. Army Major.
The British sergeant had his parachute wings on his breast pocket. They were worn on the sleeve only (unless you were SAS).
Some of the British airborne had the Pegasus patches on their sleeves facing the wrong way. They always point to the front and never backwards.
None of the British troops has the correct British battle dress on. It's a mish-mash of Commonwealth post-war uniform.
The sergeant's denison smock was old and faded. This was clearly an original smock from WWII - if it was supposed to be in 1944 it would have been nearly new.
In the first scene with the para captain, his pips are the wrong color - they should have been light blue, not khaki.
Some of the cars used are from the ARO IMS family, which were produced starting 1957.
The patches on the American paratroopers sleeves are modern 50-star American flags.