A nice example of this entertainment, assuming that Earl actually made that observation (as I suspect he did), was the 1941 Pontiac. It was the GM brand that year that could actually entertain for all 360 degrees. That's because, until the 1950s, most American cars had rather plain rear ends. Pontiac, on the other hand had its Silver Streak styling, a set of parallel chrome ridges extending along the center line of the hood and sometimes down into the grille. This feature appeared on 1935 Pontiacs and continued in one form or another through the 1956 model year. Starting in 1937 and continuing through 1954 (the 1939 model year excepted), Pontiac sedans also had such streaks running down the middle of their trunks, creating interest there.
I'm using the 1941 Pontiac rather than another year because Earl's stylists added a lot of busyness to the fenders, making '41s especially entertaining. Well, that and the fact that my father owned a 1941 Pontiac that gave young me plenty of visual and tactile entertainment.