Harris fires a bazooka into a window of a German bunker, then runs up and tosses a grenade into the window. Then the squad occupies the bunker and there is hardly any damage to the inside of the bunker.
Lt. Loggins is driving his Jeep West along the Nice promenade. In the next scene he is at the harbor in Villefranche, which is East of Nice.
Helmets worn by the Germans in the film are all World War I rather than the proper M 42 of the time. Truck and other German vehicles are shown with swastikas in a circle on their sides which is improper also. Black crosses boundaried with white on the sides coming together at the corner only; was what was proper.
Rarely are any of the military personnel, including the leading players, shown wearing ties with their dress uniforms, even while on duty, and on leave on the French Riviera.
Soldiers advancing on a bunker with a bazooka are killed by enemy machine gunfire. When Cpl. Harris (Tony Curtis) runs out of the foxhole and picks up the bazooka to shoot into the bunker, one of the dead soldiers flinches at the sound of the bazooka's explosion.
The second time Cpl Harris (Tony Curtis) is calling coordinates from the bell tower he is holding the the radio hand unit upside down.
The music played in the jazz club scene is a style from the 1950s, when the movie was filmed, not from the 1940s when the movie is set.
In the stock footage of the French Riviera, several girl bathers are shown wearing bikinis. The bikini bathing suit was not introduced till after the war.
All of the American military vehicles are of Korean War or later vintage.
All of Natalie Woods clothes are hairstyles are strictly 1958, not 1944 when the story is taking place.
Cameraderie between Sam (an officer) and Britt (an enlisted NCO whose rank goes up and down as the story unfolds), is unmilitary and unreal, particularly their calling each other by their first names.