Dennis: "There's nothing wrong in being gay!"
Does anyone else remember this line from a Grape Nuts-era episode? Obviously this line was being used only in the pre-1970s version of the definition of "gay" but it was a punchline of a joke that went like this:
Jack: That book Louella Parsons wrote is really swell, it's called "The Gay Illiterate."
Phil: Hey wait a minute Jackson, don't get personal.
Jack: Phil, I wasn't talking about you, I just mentioned the title of the book, "The Gay Illiterate."
Dennis: Yeah, there's nothing wrong in being gay!
I don't know the date of the episode, but it was guest starring Groucho Marx, and it happens about 20 minutes into the show.
I know this doesn't have anything to do with Dennis' character being gay, but it is an interesting aside! It is also quite a jolt when listening to it with today's ears.