These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Mother refuses to talk to anyone else besides Dave because she's afraid she would be put on display in the Smithsonian Institute, or put on "...the Johnny Carson show." The show would be the subject of much ridicule from Carson.
Values Dissonance: Besides the fact it's a '60s sitcom, it's a little strange to see a classic, vintage automobile treated like The Alleged Car rather than a museum piece. Dave acts a little similar to an enthusiast, at least.