I noticed the sound of the Sherman tanks canon was a "whiz-zip" sound rather than a "kaboom" like a howitzer. Also, I noticed some genuine recoil when the corporal tests out the German machine gun. And how did the director find a town he could demolish? Those Sherman tanks were fast! Unfortunately, the German major does a ballet pirouette when he is executed - normally, executed men collapse knees first .
shareActually, in the movie, they used M-24 Chaffee light tanks belonging to the Italian Army. The M24 actually did have a higher velocity 75mm antitank gun than the general purpose 75mm gun originally mounted on the Sherman, although since you never see the guns recoil when fired, they were obviously firing blanks; whether those were the actual blank rounds we hear or of they were dubbed in later, I don't know.
The M24 weighed 14 less tons than the M4 Sherman and was 8 mph/13 kmh faster.
In real life, however, the 14th Tank Battalion, which along with the 27th Armored Infantry Battalion constituted the task force that seized the bridge, was equipped with M4 Sherman medium tanks and M26 Pershing heavy tanks. There were some cavalry units in the vicinity that may have been equipped with M24s, but they were not directly involved with the seizure of the bridge as shown in the movie.
The Pershing had a very high velocity 90mm antitank/antiaircraft gun and was pretty much designed specifically to kill German Tiger tanks, while by that late in the war, most Shermans had their original "howitzer" guns replaced with a different type of high velocity 76mm antitank gun, including the only photos I've seen of Shermans belonging to the 14th Battalion at the time of the battle at Remagen.
I wouldn't make a big deal about the historical accuracy of the sound effects, as the historical accuracy of the tanks involved is off anyway.