When he and Bradley had a talk about what’s next?
That was a staff car? If so it shows its been a long time since I have seen the movie.
The movie Patton did not have any scene’s about Gen. Patton’s accident and death. The concluding scene was merely a hinting of his accidental death. Gen. Eisenhower relieved Gen Patton of command of the Third Army in October 7, 1945, 2 months before his accident. The scene at the end of the movie you are remembering was probably to represent the Sep 28, 1945 meeting between Eisenhower and Patton, where there was a heated argument over Patton’s policy and public statements.
https://en.wikipedia.org/wiki/George_S._Patton