Plumber is too good an actor to be typecast.
(seriously quoting shakespear in Klingon!)
I remember reading how the real children thought the movie went over the top in portraying the father so stern but that is the movies.
If anyone was typecast it was julie andrews. She seemed to be playing almost the same part in almost all her movies. The exception was movies she did to try and break away from the Mary Poppins goody goody image.
even this is not enough to break the no-oprah rule. starve the beast.