On Disc 1 Go to the scene selections for the following episodes...
Never Name a Duck
The Two Faces of Rob
The Attempted Marriage
Hustling The Hustler
What's in a middle name
Highlight the Opening Titles on each of these episodes and Press "Left",
Dick's head will light up, Press "enter" and you will see various commercials for Dash Laundry detergent and Kent Cigarettes featuring Dick Van Dyke and the Cast.
Carl Reiner and Dick Van Dyke allude to this egg on the commentary for "My Husband is Not a Drunk"