When Schindler convinces the head and guards of Auschwitz, first by bribes, to let the women who accidentally got sent there free as well. Then he convinces the guards to let the children go by saying that their smaller hands are needed to polish the inside of shells. The kids never ended up doing that, and the entire factory ends up being, as the narration states, "the model of nonproduction".
This is something that was unique in the history of Auschwitz.
When the Brinnlitz factory starts up, Schindler calmly tells the SS guards that if they shoot any of his workers without a good reason, they will go to prison and he will collect compensation from the government. He then forbids the guards from entering the factory without his permission, and brings out cases of liquor to secure their cooperation.
This was undoubtedly just fine with the guards. Any other assignment at this juncture of the war would've resulted in almost certain death. Very few German men from barely teens to middle-aged survived the war.
Oskar inviting and reminding the rabbi he had working for him to observe the Sabbath once they entered the final factory. Said rabbi recited the prayers loud enough for every guard in the facility to hear, and yet had no negative repercussions whatsoever.
The ending, where Schindler is going over how to deal with releasing the Jews he has saved, and he talks to the guards.
Oskar Schindler: I know you have received orders from our commandant, which he has received from his superiors, to dispose of the population of this camp. Now would be the time to do it. Here they are; they're all here. This is your opportunity. Or, you could leave, and return to your families as men instead of murderers.