I'll add that in 1942 Hitler got a seemingly legal power to replace any judge, so to some extent that codified his ability to overrule the judiciary.
In a speech before parliament on April 26, 1942, Hitler harshly criticized the way the
courts operated in Germany. He accused judges of sentencing criminals much too
leniently. He "requested" and got a resolution formally recognizing his right to remove
judges at will. He declared he would use this power to take immediate action against
every "incorrect" court decision and remove any judge from office who did not
"recognize the requirements of the hour."
The brief text of the adopted decision can be found too... it basically gave Hitler the right to remove anyone from any post... and recognized him as supreme justice (on top of the other executive and party leadership roles):
1942 REICHSGESETZBLATT, PART I, PAGE 247
Decision of the Greater German Reichstag of 26 April 1942
At the proposal of the president of the Reichstag, on its session of 26 April 1942, the Greater German Reichstag has approved of the rights which the Fuehrer has postulated in his speech, with the following decision:
There can be no doubt, that in the present war, in which the German people is faced with a struggle for its existence or annihilation, the Fuehrer must have all the rights postulated by him which serve to further or achieve victory. Therefore-without being bound by existing legal regulations-in his capacity as leader of the nation, Supreme Commander of the Armed Forces, governmental Chief and supreme executive Chief, as supreme justice and leader of the party-the Fuehrer must be in a position to force with all means at his disposal every German, if necessary, whether he be common soldier or officer, low or high official or judge, leading or subordinate official of the party, worker or employee-to fulfill his duties. In case of violation of these duties, the Fuehrer is entitled after conscientious examination, regardless of so-called well-deserved rights, to met out due punishment and to remove the offender from his post, rank and position without introducing prescribed procedures.
At the order of the Fuehrer this decision is hereby made public.
Berlin, 26 April 1942
The Reich Minister and Chief of the Reich Chancellery
Of course, one could have argued that this was unconstitutional, but nobody who did remained free/alive for long...
And judges were informed/ordered by secret letters how to apply the laws...
[Reich Minister of Justice] Thierack's letters pressured judges, who were under public threat of removal from office, to choose the path of least resistance and decide a case according to the examples set out in them, although no judge was ever removed from office for the explicit reason of having failed to do so.
The letters were classified as state secrets because the Security Service (Sicherheitsdienst, or “SD”) of the SS was convinced that the public would protest the intensification of state control over the judicial system. In a report on May 30, 1943, the SD declared, “The people want an independent judge. The administration of justice and the state would lose all legitimacy if the people believed judges had to decide in a particular way.”