I found this info on Reddit. One thing off regarding the timeline in the movie is when Vito is shot at the fruit stand. It is supposed to be just before Christmas of 1945 However when Vito is shopping. A poster is visible on the wall behind him and the fruit vendor. It advertises a fight between Jake LaMotta and Tommy Bell. That fight took place in March of 1947, 2 years and 3 months later. I found this info on Reddit.

It throws the timeline out of balance. It is also a bit ironic that Vito would later be played by De Niro as a young man, De Niro would later play La Motta in the film Raging Bull.