Tough - as any actor who's identified with a particular genre would find it - but I think he did it. He's actually had some serious moments in some of his other films, so this wasn't a complete stretch for him.
I read an interview with him that went more into his background in wanting to take on this role. And, I also read another interview with one of his cast members that said that what a lot of people forget is that a true comedian plays out that part of his personality because of the serious, "dark" part of themselves. The serious part of them is in there.
I'm intrigued by the Hollywood Blacklist. Have been for a while. So, seeing the movie gave me a bit more of a "human aspect" to go with the book knowledge that I've had before. Putting it into a context of possible actual people helps to understand what was going on in that time period better.
Martin Landau said that it's hard for those of us who didn't actually experience that time in history to really understand the significance of what was going on. That just 5 years before that, people were collecting money for the Russian orphans. That Russia was one of our allies. Then, almost overnight, the Cold War changed what everyone was to believe. In the blink of an eye almost, the attitudes of the people changed - whether they understood why or not. We've experienced 9/11, and he likened it to that in a way. In just a matter of time, people's lives were changed forever. And, in the case of the Blacklist, you had people who had to totally change their very identities. Even as recent as 2000, the Screen Guild was trying to rectify what had happened by going through movies of that time to put the real names of the people involved in their rightful place in various movies and in the records of the day.
Like I say, I really thought this one was an overlooked potential classic. It had the right mix of people, plot and other details that made it much better than I'd anticipated.
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Cats know what we feel. They don't care, but they know.