When the Kearns family goes to a restaurant to celebrate the successful invention, in the mid-1960s, there is a Pepsi sign featuring a logo that wasn't introduced until 1971.
Ford had electric intermittent wipers available for the full size models by 1968, same year as the Lincoln Mark III they installed his invention on. The Ford version also had a "ready" and "park" position, which his didn't.
Dr. Kearns's first patent for intermittent wipers was filed on December 1, 1964. Ford already had a system in production by 1965, same year of the car he drives in the start of the movie. They were sold on Mercurys and Comets. They were mechanical vacuum bleed timing devices, but worked well over a wide range of delay.
The following FAQ entries may contain spoilers. Only the biggest ones (if any) will be covered with spoiler tags. Spoiler tags have been used sparingly in order to make the page more readable.
Q
Is "Flash of Genius" based on a book?
A
Flash of Genius is based on a 1993 The New Yorker magazine article written by journalist John Seabrook about the life of Robert Kearns, inventor of the intermittent windshield wiper. It was adapted for the screen by screenwriter Philip Railsback.
Q
Didn't a woman invent the windshield wiper?
A
Yes. Mary Anderson in 1905. Kearns' invention is the system that improves upon the wiper, wipes intermittently, once every second or every 10 seconds, adjustable and set by the driver.