The entire family is now seen during the opening theme and each person steps away from the cow.
The Garfield book Mary buys, "Garfield Hangs Out", was the 19th Garfield compilation book and was released on October 18, 1990, which means the episode takes place on or after that date.
Character dialogue establishes that Meemaw and John had been together a year within the story universe.
As of this episode, Jim Parsons, who narrates as adult Sheldon, has portrayed his The Big Bang Theory (2007) character more than any other of the original cast of that show.