The tanks are shows crashing through forest. There is no way the radio tracking van that was part of the convoy would have been able to follow them through that terrain.
The party were being followed by three Russian tanks for a number days. In all that time there was no sign of a fuel tanker. Tanks are very fuel hungry and would not have been able to sustain the pursuit without refueling.
About a minute into the movie the narrator says "... posing as a Wehrmacht Major ...". How is he going to explain that branch and rank when asked for identity papers? He is wearing the uniform and rank insignia of a Waffen-SS Obersturmführer; the equivalent rank for the Wehrmacht (Army) is Hauptmann = Captain.
At around 35 minutes, a scene shows a radio direction finding vehicle locating the civilians listening to a radio receiver. This is not possible. RDF technology is used to get a direction to a radio transmitter which is propagating electromagnetic energy, not a radio receiver which is a passive device that just picks up the signal from the transmitter.
The RDF (Radio Direction Finding) vehicle shows the loop antenna spinning like a radar antenna. RDF equipment does not spin their antenna. Normally, the operator would rotate the antenna slowly by hand, finding the two opposite directions where the signal disappears. The operator then knows the transmitter is in one of those directions and draws a line on a map/chart. The vehicle is moved to another location and obtains another direction line. Approximately where the lines cross is the location of the transmitter. This is the reason that smart underground operatives would keep their transmission short and move frequently to avoid detection.
When the Russian tanks fire, a special effects charge is clearly visible inside what ought to be the empty main gun barrels.
At the end of the air raid on the German facility a formation of three USAF C-119 cargo aircraft fly over. The C-119 didn't begin production until 1949.