In this episode James Hong plays a doctor (uncredited). He also makes an appearance in episode 6.8, Edith Breaks Out (1975), a waiter in a Chinese restaurant (who's also the owner).
First mention of Archie having been stationed in Foggia, Italy during World War II.
The issue of blood compatibility between races was revisited in "Archie's Operation" (S7, E6).
At the finale, Archie, Edith, Mike and Gloria are playing Monopoly again. Archie rolls the dice, and long after the roll is completed, one of the dice mysteriously flips on its own to another side.