I had the fortune of seeing BOTH this version and the 1931 Frederic March version only about a week apart. Because of this it gave me an excellent chance to compare and contrast them. And it also gave me a chance to see that the two films were extremely similar--so similar that the later MGM film seems more a remake of the 1931 film and not an adaptation of the original book. There was much more similarity between the movies than the book. And, while they both are good, I would definitely say that I preferred the earlier version.
Since the 1931 film was made during the so-called "Pre-Code" era before the guidelines of the production code governing morality in pictures was enforced, it is a more "earthy" and sexually charged film. In this earlier version, March develops the chemical formula simply out of curiosity and a desire to "sow wild oats" without detection. In other words, since Mr. Hyde looked more like a half-man/half-chimp, he could whore around without getting caught or ruining his reputation. The 1941 version had much nobler intent, as nice-guy Dr. Jekyll created his elixir in order to separate the good and evil aspects of our personalities so we could live purer and more wholesome lives without our subconscious evil desires impeding us! In addition, since the 1931 version was pre-Code, it tended to show more skin and imply more about sex, whereas the 1941 version showed Hyde more as a sadist. In general, the 1941 version was a little bit tamer and more "family-friendly", though I think both are fine for older kids.
There were a few negatives I noticed in this otherwise well-made film. One was that Hyde looked almost exactly like Dr. Jekyll. This MIGHT have been a daring and intelligent way to take the movie (though certainly NOT in keeping with Robert Lewis Stevenson's book)--showing the "monster" as looking like a sloppy man, but a man nevertheless. However, this makes no sense, as Ingrid Bergman (the woman Hyde desires) already met Dr. Jekyll BEFORE meeting Hyde and yet couldn't see that they were the same guy! At the very least, she should have thought they were brothers! But, to go to Dr. Jekyll and complain about how abusive Hyde was just seemed silly.
Also another quibble is with the choice of Ms. Bergman as the earthy barmaid (in the 1931 version, she seemed more like a prostitute than a member of the working poor). Changing her part a bit wasn't the problem, but that Ingrid sounded like a Swedish lady trying to sound Cockney--which is what she was! At times, she forgot the accent altogether and at other times she just sounded kind of weird. She was a wonderful actress, but the casting decision was dumb.
As far as Tracy goes, he was fine as Jekyll, but there were times when it was obvious that you were watching a stuntman instead of Tracy. The scenes just weren't done very well and you can't blame Tracy for this but the director. Just watch the scene in the hallway after Hyde's confrontation with Bergman--it's pretty obvious that the guy jumping about isn't Tracy and it doesn't look much like him.
One observation about Tracy. I've recently read a biography about him and choosing him to play the lead was pretty interesting because in real life, Tracy definitely had a "Jekyll and Hyde" personality. When he was sober (which apparently wasn't often enough), he was a sweet guy, but when he drank he was abusive and very reminiscent of the dreaded Hyde. I wonder if anyone at the time noticed this.
