The baseball card in question is a 1948 Leaf #4 Stan Musial rookie card. For it to be worth $60,000 it would have to be graded 8.5 or better. A grade 9 has sold for $250,000.
This episode has been written by the series regular, Chi McBride (Lou Grover).
Louis Gossett Jr. , who played Grover's father, was an 1980's icon of the Silver Screen and Television. He may be remembered from such films as An Officer and a Gentleman (1982), Cold-War era action-adventure thriller Iron Eagle (1986) franchise (I-IV), and the mini-series Roots (1977).
The football game that Big Percy and Will Grover are watching is a CFL (Canadian Football League) game featuring the Toronto Argonauts. The CFL does not play any games on the U.S. Thanksgiving as they are on the lead in to their championship Grey Cup Game.
Gladys Knight, Grover's mother, is also known for her singing credentials. She was with the group Gladys Knight & The Pips.