trailer for the upcoming “Saturday Night” film, Chevy Chase (played by Cory Michael Smith) takes one of his trademark tumbles backstage.“Sorry, I tripped over my p—-,” the character smirks.In that brief, humorous moment, it’s hard not to flash back to the deadpan comic’s legendary career. For us, we immediately conjured up images of Chase in “Caddyshack,” “Three Amigos” and, of course, “National Lampoon’s Christmas Vacation.”Thankfully, Chevy hasn’t forgotten his most famous holiday film either.From Nov.