The movies opening scene where conscripts cross the river by boats, half of them are given a rifle and the other half ammo, and then they charge at a fortified German line with no support, and the survivors are gunned down by a blocking regiment.
I've asked about the rifles before so I know that part is fake, and I believe I've heard about the blocking regiments being a similar myth (they existed but they weren't just machine gunning down survivors of failed human wave assaults), but how about the whole charge? Hollywood seems to be obsessed with depicting the Soviets as dumping men onto the battlefield and using absurd cruelty to keep them from running away from certain death but how truthful is that? I'm suspicious because American soldiers are never presented as being pushed out of their landing crafts at Normandy by evil commissars executing random people on the spot as traitors and cowards while the soldiers just try to survive rather than push objectives.
Hollywood also doesn't have a reason to demonise the Western Allies like it did the Soviets, hence why we don't see US commissar-equivalents. More can be said on the matter if anyone would like to address this myth-complex; for the meantime, we have some previous posts that are right up this alley.
u/Georgy_K_Zhukov has a thorough dissection of the Enemy at the Gates mythset - that is, the entire set of 'one with the rifle, one with the ammo', the blocking detachments, and the charge itself. They also have an extra bit on 'human wave attacks'. (There's also another excellent thread covering why Red Army casualties remained so high even later in the war, which may be helpful in understanding how the Red Army actually went about its business, but it isn't significantly related to the current question - let me know if you want that one too.)