Harvey says a lot about filmmaking, and possibly only in retrospect
after 64 years of the business and art continuing to change. Whether it's
evolution or not depends on who is asking, but most people who watch
Harvey will be able to explain why it's a great movie.
Harvey began as a play by Mary Chase. The play itself, in print, I'd
like to believe would be as in-demand as Shakespeare is in print.
That's why the movie works. It begins with a strong script (written by Chase and
Oscar Brodney), and ends with an amazing performance by James Stewart that I
believe redefines what it means to be a comedic actor. In the middle of all that
are amazing performances by, among others, Josephine Hull (who won an Oscar for
her role as Stewart's sister), Peggy Dow, and Charles Drake, and great direction
by Henry Coster.
Harvey has multiple storylines to take the focus away from its main characters (Harvey and his friend Elwood P. Dowd, who's played by Stewart). Also, Harvey and Elwood aren't always hanging out together, which allows some breathing room for the actors and audience to also focus on who their characters are. This works especially well for Stewart as Elwood because Elwood is a remarkable man.
I seriously need to see more of Stewart's movies...Patrick Stewart, too, but that's another story | Copyright 1950 Universal Pictures
The rest of the film is rounded out by that excellent cast mentioned above, as they try to figure out how crazy Dowd is, and figure out their own problems. It's mostly love-life stuff, and thankfully it's not overly mushy (I think that was also a product of the times, but I'm not sure.)
I don't want to give anything away, but I'll leave by saying that this film is one of the best escapist movies. Just forget your problems for a while and watch it because Harvey shows that sometimes that's the best use of your time.