was Richard insane?

The thought was running through my mind the entire film. If he's not medically or technically insane, I'm sure he would be deemed so if tested. He has almost schizophrenic qualities. The way he talks to himself is so annoying, and is reminiscent of Hamlet, who actually was insane (well, some would argue he's not but let's not get into that). And the fantasies, the paranoia, it all points to insanity. Anyway, insane or not, I hated his character. He was so annoying. I don't know if Wilder was going for "cute" or "funny" with this character, but I felt he was more annoying than anything. I read that, in the play, Richard had an inner voice that was almost like a character on it's own, and I think that if they would have included that in the film, it would've been miles better.