While it's intermittently moving and generally well-acted, the film version of Broadway hit Dear Evan Hansen, as you may have heard, has a number of problems: an unconvincing, even preposterous premise; blithe depictions of teen depression and mental instability; a 27-year-old lead cast as a high-school student. We'll get to those shortly. But the movie's biggest issue, it seems to me, lies in a sensation that you might only recognize if you've seen a lot of stage musicals, or least a lot of sub-par ones.