The glass that Ruth uses in the kitchen while talking to her friend and while the dogs lays on the floor are the same glasses that are used throughout the Cosby Show series. They are little glasses with blue lines and decoration on them. You can see them in episode 152 "Bird in Hand" of the Cosby Show.
This episode is based on the "One Foot In The Grave" episode "The Valley of Fear", in which Victor Meldrew forms a neighborhood watch organization. It also borrows an element from the episode "Warm Champagne" in which an elderly woman is wrongly brought from the hospital to Victor's house and is discovered sleeping in his bedroom.
Cosby was actually a remake of the great BBC sitcom, "One Foot In The Grave".