I got 19 out of 20====only one I missed was the first one about where the light dimmers were on 1940s cars, and I'm too young to remember that!
I had a '63 Chevy pickup that had that kind of dimmer. My brother had a fortysomething Dodge pickup that you turned the key in the ignition, and then stepped on a starter on the floor. My '65 Corvair had a push button transmission on the dash.
Heck, our family station wagon, affectionately named "Joey," had the dimmer switch on the floor! Sometimes, I still want to reach over there with my foot...
My memory tells me that light dimmers stayed on the floor until the late 60's and early 70's. My '72 Chevy Blazer had its dimmer on the floor, I'm sure.