As Andrea is crossing over to Adolf Hitler's crib, you can see the baby waving its arms about. But when the camera cuts to the baby, it's asleep lying perfectly still.
Alois Hitler makes numerous racist remarks about Jews and Gypsies and expresses the hope that Germany and Austria will one day be unified. The implication is that Adolf Hitler inherited these attitudes from his father. In reality, Hitler did not become exposed to racist rhetoric until he moved to Vienna to study art in 1907, four years after his father's death.
In real life, Adolf Hitler had an elder half-brother, Alois Hitler, and half-sister, Angela Hitler, with whom he was raised. Neither of his half-siblings are seen or mentioned in the story.