Firstly, I'm aware that movies such as this will use (or abuse, depending on your sensibilities) artistic license for dramatic effect.
(For those who haven't seen it, there are provocative images of children murdered by the SS for refusing to fight in defence of Germany depicted at the start of the film)
However I've recently had to argue the level of real history in this particular film. Having failed to recover any information regarding the display of murdered children online, I turn to you Historians!
Has anyone researched this to any extent?
There's little in the way of photographic evidence, but it's plausible. Combatants who attempted to surrender, desert, or who pointed out the hopelessness of their case would often be lynched or denounced by local Nazi officials, or the SS.
The reality of war in April 1945 meant that HJ members were indeed combatants in the eyes of the German military system, as were old men in the Volksturm. This meant boys as young as 12, 13 and 14 were either dying in combat to the advancing allies, or being rounded up and shot for their avoidance of combat. The most allegedly documented cases of any of this is Berlin itself, its worth mentioning, and I'd be confident in hazarding that if it did happen, it be far less common to the West of Berlin in the countryside; simply less command and control there.