Sorry about repeating a post again, but there is another thing I want to bring up about Bob and Linda. They really can't be playing real life characters, because in real life Bob is married and has five sons I believe. On the show he's a bachelor and was involved with Linda, so I don't know whether or not he'd really call his character 'Bob McGrath.'
Also, in response to the names on the list. I believe Mr. Hanford's name was also 'David.' (No connection to Northern Calloway's character) I remember an ep where his niece called him 'Uncle David.'
'Gina Jefferson' is pretty much understandable since I've seen the name on the door of her vet's office.