As a junkie movie credit reader (I was staying through the credits long before there were post-credit and inter-credit scenes), I notice screenwriters. Often I use the information to track down other movies I ythink I might like. But sometimes the screenwriters are surprising, either because they later got famous (often in another context) or the movie (or TV show) is outside their usual milieu, or you just didn’t expect it.
Mario Puzo – Superman and Superman II What was the author of The Godfather and other gangster books doing writing a comic book hero?
Erich Segal – Years before he wrote the book Love Story (and the book and screenplay of the sequel), he was co-writer of Yellow Submarine, the trippy Beatles animated movie
James Clavell – I’m still surprised when I see his name on The Great Escape, although he’d already written King Rat about another WWII POW camp by then. But he also wrote a lot of other screenplays and teleplays, including two episodes of Man Into Space and The Satan Bug
Roald Dahl – He wrote the original script for the James Bond film You Only Live Twice. Okay, he was a friend of Ian Fleming’s, but does that qualify a childrens’ book author to write adult spy flicks? He wrote a piece for Playboy on how he came to write the screenplay.
William Faulkner and Leigh Brackett – It’s not often a Nobel prize winner for literature and a Golden Age science fiction/fantasy writer team up on a screenplay. They co-wrote The Big Sleep (so if you liked The Big Lebowski, you have them to thank, partly) Both of them wrote lots of other screenplays, which still amazes me. In particular, Brackett wrote the original screenplay for The Empire Strikes Back. One of the few times a Golden Age author wrote part of the lineage of a blockbuster SF./fantasy movie.
Harlan Ellison – he’s written of of scripts, especially for TV., but generally for science fiction (Star Trek, Outer Limits, Masters of Science Fiction, Voyage to the Bottom of the Sea) or “cult” TV (Burke’s Law, Man from U.N.C.L.E.). But he also wrote an episode of The Flying Nun Really. Of course, he signed it “Cordwainer Bird”
Anyone else?