Aharon Yariv, who later went on to be head of the IDF Intelligence Directorate and a cabinet minister, shows Lansky a concentration camp tattoo. Yariv served in the Haganah and the British Army and was never an inmate.
A scene set in 1918 shows a very mature-looking Meyer Lansky and Ben Siegel, who in real life at the time were just 16 and 12 years old, respectively, not grown men.
The film suggests Salvatore Maranzano was killed around the time Lansky assisted with the war effort. His killing actually took place in 1931.
At 1 hour 42 mins in the synagogue, there is a three-branch menorah. In a synagogue, it would be a four-branch menorah (hannukia).