When it comes to those old flicks from the 40s, 50s, 60s, and 70s, I think most of us were used to seeing the occaisonal aircraft stock footage being used for the wrong aircraft (i.e. Japanese "SBDs"). After all, the average film editor probably couldn't tell the difference between a Val and an Avenger in sillohuette. And the average person isn't likely to notice one or two mix-ups. After all, a plane is a plane, right?
However, I recently watched the Midway movie and was shocked by how badly they really screwed it up. There were some sequences where they used footage of SBDs, Avengers, Helldivers, Hellcats, Corsairs, Wildcats, and Mitchells

interchangeably as the SAME aircraft. If it was blue and had American markings on it, it was fair game. It was comical to guess what aircraft would pop up next with each different piece of stock footage they used.
I also recently watched the Flying Tigers movie with John Wayne and couldn't help but notice the mockup P-40s. I think was likely due to a shortage of spare P-40s at the time the picture was filmed (it was still 1942, after all). But at least they knew was P-40s looked like...well, sorta.
Any nominations out there for worst aircraft accuracy in flicks?