Clockwise from bottom left: Chevy Chase as Clark Griswold, Juliette Lewis as Audrey Griswold, Johnny Galecki as Rusty Griswold and Beverly D'Angelo as Ellen Griswold in 1989's 'National Lampoon's ...

For almost as long as there have been films, there have been Christmas movies to go with them. But it wasn’t until television came along that watching Christmas movies became a true holiday tradition.

Factoring in the number of times I've seen National Lampoon's Christmas Vacation, I would've thought it was impossible to catch something I'd never noticed before, and yet here we are. During my ...