[Dr. Sivana]

He had the good sense and humility to rework the concept bringing in Dick Van Dyke as the main character.

Yes, which allowed him to also bring in Mary Tyler Moore as Rob's TV wife. She would not have been credible as Carl Reiner's wife. Casting was A-1 except Richie.

[colorado tanker]

Richie was a whiny little kid who I wished they would lock in the closet. :-))

I contrast him with Ron Howard who was a terrific child actor on Andy Griffith.