When Flor and Glasha meet the armed partisan on the island in the bog, Flor picks up his rifle, and it's so covered in mud he can't even use it. Yet when they're led to his burned father, and he turns around after he speaks, the rifle is spotlessly clean.
When one of the Partisans uses a belted machine gun used to shoot the captured German soldiers, it doesn't eject any empty shell cases.
The white stork that finds Flyora and Glasha in the forest is a captive, flightless bird. All of its secondary flight feathers and half of its primaries have been cut off.
Many of the vehicles are post-World War II Soviet vehicles with slapped-on German Army markings.
The aircraft Flor and Glasha see flying over the forest seems to be a Focke-Wulf Fw 189 "Uhu", a close reconnaissance and light bomber plane. It had very little payload capacity and couldn't drop paratroopers.
The Film is set in 1943 however a German Soldier can be seen with a STG44 which was not in service until August 1944.
In the Russian language version, when the villagers are about to be herded into barn, the Russian collaborator says in very clear English "Hauptmann do we invite them in, any signal or not?", a line from the English dubbed version.
In the barn scene near the end, a man peeks out the window and is immediately shot. The sound of everyone else in the barn screaming stops for a second when gun sound effect plays.