When Audie Murphy reports to his unit, he is carrying a duffel bag. When he hands his orders to the 1SG, he has a blue laundry bag as well. With the next shot, he is carrying only the duffel bag.
In the first battle scene Murphy takes his pack off & 2 hand grenades are on the ground. Murphy picks up both grenades in his left hand, then charges at the German gun emplacement. When he is going down to take cover there are no hand grenades to be seen & he has only his M-1. This is at about 35:20 to 35: 37 into the movie.
When Audie Murphy arrives at the 3rd Division, he's told to inspect the "Third Platoon". Later on, the same unit is referred to as the "First Platoon".
In the final combat scene, Audie Murphy is shown on an abandoned and burning M4 Sherman tank, firing its .50-caliber machine gun at the German attackers. In fact, Murphy performed this heroic action on an M10 tank destroyer, not an M4 tank.
During Audie Murphy's Medal of Honor ceremony at the end of the movie, the narrator makes two mistakes as he describes the other decorations for valor that Murphy received: he mentions "a Bronze Star Medal" (Murphy actually received two BSM's); and "a Bronze Star Medal with bronze service arrowhead" (the correct award is the European-African-Middle Eastern Campaign Medal with Bronze Service Arrowhead). The narrator also omits two significant awards that Murphy earned: two Presidential Unit Citations and the Combat Infantryman's Badge.
When the 3rd Division is in North Africa, it is 1942-43. All of the soldiers are carrying M-1945 field packs, cartridge belts, canteen covers and E-tool carriers. The correct field gear would be the M-1928 gear. It is similar in appearance to the M-1910 field gear in that it is a long narrow pack in a more mustard green color vs. dark olive green.
When Murphy is talking to the Battalion Commander and his Company Commander and finally accepts the field promotion to 2nd Lieutenant, he salutes and does an about face to the Left which is incorrect. "About Face" is always done with a turn to the Right.
When Murphy is shown atop the tank destroyer firing the machine gun while winning the Medal of Honor, his helmet shows him wearing the silver bar of a First Lieutenant. But Murphy wasn't promoted to that rank until three weeks later. He won the Medal while still a Second Lieutenant.
Audie Murphy ages much in just a bit less than five years time, but his younger siblings don't appear to at all.
At about 2:10 into the movie, the paper leaning against a bottle(?) on the Generals desk moves on its own.
The farmer that Audie goes to work for said he quit school to join the military in the great war, WW1, if he was 17 when he quit, he would have been around 40 when WW2 started, but he looks at least 60.
At about the 55 minute mark when Richard Castle goes to push Marshall Thompson's arm away he inadvertently hits Jack Kelly in the face.
The tanks being depicted as German tanks are actually American M41 Walker Bulldog tanks., used by the U.S. Army from 1951 to the late 1960s.
All the Germans in the film are wearing WWI helmets rather than the proper M42 worn in WWII.
When Audie Murphy arrives in North Africa and inspects the squad, Kovak does not close the bolt on his rifle as is required to complete "inspection arms."
When the squad was on the tank talking with the tank commander, Kerrigan mentioned something to the effect of you guys got it made with a couple of hundred thousand dollars worth of armor around you. The tank commander said this tank only has 4" of armor on it. Actually the M-4 Sherman had only 2" of armor on the front and 1.5" of armor on the sides.
The movie begins with a 12-year old Murphy and his younger siblings who look about 6 or 7 years old. Then, six years go by and Murphy plays himself at eighteen. However, none of his siblings have aged.