Another curious omission, along with the Spanish Civil War is the Molotov-Ribbentropp pact between Nazi Germany and Stalin's USSR. Although Mussolini says that Hitler has invaded Poland, he doesn't mention the bizarre temporary alliance between the Communist and National Socialist states.
The portrayal of Mussolini's role as go between in the Munich Conference is accurate. The British Prime Minister Neville Chamberlain and his government used him to influence Adolf Hitler into a softer approach on the Sudetenland issue, and not to conquer all of Czechoslovakia. Neville Chamberlain's phrase "Peace in Our Time" can be seen in this episode. Chamberlain was later lambasted when WW2 started a few months later, and he was replaced by Winston Churchill but many people now believe that the delay bought time for Britain to become better armed and prepared when war finally arrived in 1939.
Mussolini's involvement in the Spanish Civil War is only mentioned in a single line of dialogue. This is a strange choice, as it was a major event in Mussolini's history, but in line with the fact this series prefers to dwell on his family and relationships. For one, it was Fascist Italy first use of its military against a major European country, and secondly, it was the first time Mussolini and Hitler were in a practical alliance with one another, in 1936. Some historians see Mussolini & Hitler's involvement in this war as a precursor to WW2, especially as Stalin offered physical support to the other side. However, the Fascists in the form of Mussolini, Hitler and Franco won. Fascist Italy's support to Franco's rebels was massive - in a three month period Mussolini sent to Spain over 200 aircraft, 2,500 tons of bombs, 500 cannons, 700 mortars, 12,000 machine-guns, 50 whippet tanks and 3,800 motor vehicles. By the end of 1936 there were 3,000 members of the Black Shirts in Spain. They took part in the fighting around Madrid and participated in the fall of Málaga in February 1937. By this time their numbers had increased to 30,000. There were also 20,000 members of the Italian Army fighting in Spain.
Hitler did indeed excoriate Mussolini over his invasion of Albania and Greece. Mussolini's successes in Spain a few years before may have made him overconfident. The invasions had serious consequences for the Axis - not only did the Greeks manage to mount one of the deadliest and most formidable resistance movements in Europe, it also meant that Hitler's forces had to come to Mussolini's rescue leading to a serious delay in his advances through the Soviet Union known as Operation Barbarossa. Because Barbarossa was delayed, the Germans ended up having to mount major operations in Russia, Belarussia and the Ukraine in the depths of winter, which helped lose them the war.