This is a fascinating film. It is talky, yes, but courtroom dramas are. The law matters and the arguments are facsinating - and who makes the law? Dictators do if they are in power, and Hitler never did anything illegal therefore...
Many have played Hitler, and the core of the man is how to do it - not to be a cartoon character. Ian Hart does that here.
Other actors spot on, and Bruckner as Hitler's aide is a fascinating character who fell out of favour in 1940 and suffered no Nuremburg trial or any punishment post WWII (died 1954 aged 70). 97% SS men did not either.
The actors are first class. The script from court transcripts. Litten is from Konigsberg - now Kaliningrad a Russian enclave. many cities in central/eastern Europe have German and Russian and local names.
Also worth watching the drama documentary about another lawyer Josef Hartinger - who survived the war and died in 1984! - who in 1933 tried to stop the Nazis by using the law to investigate and prosecute SS guards for murders at Dachau, where Litten ended his days in 1938 by his own hand apparently. Watch "The First Six Months in Power", the second episode of the 2019 BBC documentary Rise of the Nazis which describes the investigation into the murders at Dachau when he was deputy state prosecutor