There was hardly any camaraderie developing between Romanian and the Soviet Army, not to mention the Romanian population and the Soviet soldiers after 23rd of August 1944 when the action is supposed to take place. in fact there have been many cases of misbehavior, crimes and even friendly fire reported.
Soldiers in march don't even react to what is called "stray shells", although they fall very close to their rows and vehicles. Soldiers are trained to drop and protect themselves when they hear incoming artillery fire, stray or not.
During the dogfight scene, the fire sound effect does not match the alignment of the planes - neither one of them can possibly have a fire solution in order to be able to shoot. Although there is no visual effect to go with the sound - there is no smoke, flames or traces of bullets.