I just thought of this one, a whole bunch of the popular cartoon characters of the 1950s and 1960s had speech impediments, like Daffy Duck, Porky Pig, Donald Duck, etc. While not racially insensitive, it was certainly insensitive to children who had/have speech impediments, especially since many of those characters were portrayed as being rather lower on the IQ scale.
Come to think of it, did Porky ever wear pants
--if not that's whole different issue!
