Julie Sommars and David Froman, who were both regulars on the series "Matlock" guest star in this one. This was the first of several occurrences when stars of other popular TV shows would make an appearance, especially in the first few seasons to garner viewer interest. Some of the other 'big names' who played a guest role (some more than once) included actors from M*A*S*H*, Emergency! and even Star Trek.
When Mark visits Charlene (and is mistaken for a Dr called to check out her infected tattoo) he hands an umbrella to the maid/housekeeper - even though it wasn't raining - which she then carries through the house in a very ostentatious way. The umbrella has the head of a bird similar to the one used in Mary Poppins !
Perhaps this was an Easter egg planted by Dick ! There was no reason for it to be displayed so obviously .