When was Dreyfuss ever blonde??? His hair was dark brown & by '74 he was starting to go gray prematurely. Any highlights in the sun that you can clearly see in the film were gray. For some reason, this show portrays him as a redhead, which is odd.
From what I've seen he seems to be working a little too hard to be "HOOPER" rather than just plain old "Richard Dreyfuss". A mistake I thought , as actors, they would very much try to avoid. The camera's are not rolling here. And he also didn't get the beard right. Little details but they matter.