Hamlet! Willy Loman! Blanche DuBois! Those are three of the most famous roles in the theater. I guess you could call it a role roll call. Or, if you’re as confused by homophones as the writer for Yahoo! Movies, you’d call it a role call:
A roll call is “the reading aloud of a list of names of people, as in a classroom or military post, to determine who is present or absent.” And that’s what the writer meant.