Even today, the phrase "Eddie Haskell" is known to refer to an insincere brown-noser. . .He was known for his neat grooming—hiding his shallow and sneaky character. Typically, Eddie would greet his friends' parents with overdone, good manners and often a compliment such as, "That's a lovely dress you're wearing, Mrs. Cleaver."
It's the parts in italics that I was thinking of. I have ABSOLUTELY NOTHING to base any of the "shallow and sneaky character" parts of this description to Kohring's attorney. And after 50 years, I'm sure he's had time to work through all that.