This can be seen in the very beginning of the movie where Patton stands before his troops in front of the American flag and gives a speech. After comparing the speech given in the film to the real address given by Patton himself, I feel some of the words were changed in the film to keep a PG rating yet, the speech was almost exactly the same as the one Patton delivered to his troops before the commencement of operation overlord. (Stacy, 1).
Another thing that emphasizes the amount of truth in the movie is the director's use of actual World War II newsreels through out the film. These depict the various major battles and their outcome such as Patton's drive through Sicily to liberate Palermo and his subsequent entrance to Messina, much to General Montgomery's chagrin. The newsreels are again used during Patton's European campaign with his 3rd Army as they liberate town after town through out France and into Germany including his relief of Bastogne. My personal feeling is that they were used not only to give credit to the actual events but as a way to inform the viewer of what was going on in the movie without a lot of time consuming details. .
Also adding to the amount of historical truth in the movie is Patton's interaction with the other characters in the film, characters such as American General Omar N. Bradley played by Karl Malden and British General Sir Bernard Law Montgomery played by Michael Bates. Patton's friendship with General Bradley is a constant theme through out the film just as it was in real life. The film accurately portrays both Patton being Bradley's boss in Africa and Sicily as well as Bradley being Patton's boss in Europe. (Finke, 11-13) Patton's and General Montgomery's feuding during the movie was in my opinion a perfect portrayal of their real life differences as well as their similarities. It is common knowledge that the two had different strategy ideas in real life and equally common knowledge that they were both rather flamboyant, often referred to as prima donnas.