For the book

On his rocket ride to the Pacific, Mr. Baynes is seated beside a German artist who spend much of their flight deriding pre-war art as decadent and Jewish. Baynes tries to ignore him, but after the German says the two of them are racial kin, Baynes reveals he is a Jew. Not only that, but there are other Jews living in reich territory, some in the highest branches of Nazi government, all hiding in plain sight. When the German tries to bring up the police, Baynes assures him that no one will believe what he says and Baynes has high enough connections to get the German arrested if he tries. And as the two are departing the rocket, Baynes tells him that he doesn't like his looks and may just decide to report him anyway.
- Except Baynes may be lying just to mess with the idiot who annoys him. Unadvisable, of course, but is it awesome?
Mr. Tagomi taking down the two assassins sent after Baynes with his antique Colt 44.
Mr. Tagomi telling the German official exactly what he thinks of him and his culture, before signing Frank's release.

For the TV series

Episode 2 - Sunrise

Juliana using her Aikido training to throw the SD executioner over the railing of the dam.
Smith is ambushed by resistance fighters who take out his driver and a fellow officer. Armed only with a pistol and Nerves of Steel he kills all his attackers but one. The moment that sells it is when he picks up his wounded comrade's gun-he just calmly walks over while his attackers are reloading, picks it up and shows of border line Improbable Aiming Skills with a Walther P-38, a pistol whose trigger pull is so heavy it's commonly said to be good for "eight warning shots and one aimed throw."

Episode 10

Adolf Hitler may still be a self-righteous monster in this universe, but he has ice water running through his veins, even when a man has a gun to his head and the head of his security services is plotting to remove him.
This Hitler's opposition to nuclear war is another particularly dark example of this trope. A sterling example of Evil Virtues.

Episode 10 - Fallout

This episode solidifies Juliana's ascent from Action Survivor to all-round badass, when she manages to overpower the Resistance members during an attempt on her life.
An arguably villainous variant, when Himmler arrests Heusmann and his co-conspirators, finally taking the reigns of the Third Reich and announcing Smith's heroism to the the thousands of troops assembled in the Volkshalle.

Episode 1 - Now More Than Ever, We Care About You

Juliana manages to get the drop on the multiple Reich black ops agents raiding the Abdensen's farmstead with alternate!Trudy finishing off the last gunman who had Juliana in his sights. Remember, these are the Reich's finest Lebensborn assassins who had earlier managed to get the drop on the Man the High Castle himself.
The scene where the Imperial Japanese Navy rolls into the San Francisco Bay with the pride of their fleet a Yamato-class battleship (possibly the Yamato herself having escaped its fate in this alternate reality) leading the battlegroup. Naval warship fans can rejoice at such an awesome display of military might.

Episode 8 - Kasumi (Through the Mists)

Mr. Tagomi taking down the highly trained Lebensborn gunman sent to assassinate him, using just a wooden staff and his own mastering of bōjutsu.

Episode 10 - Jahr Null

Wyatt and his sniper buddy nearly assassinating Himmler, then completely getting away with it by blending into a crowd of rowdy Nazi-supporting youth that were riled up by the ongoing Nazi-sponsored festivities.
- Hell, just the very fact that Wyatt's response to Julianna being captured by the Nazis is to immediately travel to New York City and put a bullet in their leader. The man clearly doesn't mess around when people he cares about are involved.
Mark Sampson sitting down at a table with two men who make a living ratting out Jews to the Nazis. They boast that they can "smell" them, to which Mark says "you better get your noses checked, 'cause you got one sitting right in front of you." And then he blows both of them to hell.

Episode 7 - No Masters But Ourselves

The Black Communist Rebellion bombing the Japanese Pacific States' main oil pipeline and a Japanese oil tanker in San Francisco Bay. The Japanese Emperor then gives in to their demands for a homeland by ordering the Japanese to withdraw from their occupation of the Pacific States.