There's definitely a lot that's been overdramatized -- as if Bologne's actual life needed any Hollywood fantasy added to it!

The entirely fictitious violin duel with Mozart is actually a disservice to Bologne. The only time Mozart could have met Bologne as an adult, it was Mozart who was trying to prove himself as a serious composer and not merely a child prodigy, and it was Bologne who was the established virtuoso. Bologne's early violin concertos had very likely influenced Mozart's. Bologne was conductor of Paris's best orchestra at the time, and actually turned down Mozart's "Paris" symphony; Mozart ended up having that symphony played by a less prestigious orchestra, and may have held a lifelong grudge against Bologne for it.

Bologne was influential in the development of the violin concerto in that he was an early adopter of new bow designs, and was the first to compose for solo violin with the capabilities of the new transitional bows in mind rather than assuming a baroque bow. He was eventually one of the first violinists to adopt the modern Tourte design.

Another interesting historical footnote: one of the people Bologne trained in swordsmanship was a mixed-race man named Thomas-Alexandre Dumas. When Bologne raised a regiment of volunteers from the French Caribbean for the French revolutionary army, he named Dumas second-in-command. Thomas-Alexandre Dumas went on to become the first general of African descent in the French army, and his son Alexandre became even more famous as one of the giants of French literature.