Archie gets the idea of suing a mushroom company when he thinks he is poisoned, and wants to enlist an attorney named Rabinowitz, who represented Archie in a car accident case in the first season as Archie recollects. The opposing attorney in that old case was played by actor Richard Stahl, who also plays the doctor who treats Archie for food poisoning in this episode.
You can see the black nose plugs Sally Struthers is using to sound like she has a cold.
Edith mentioned that Archie's mother Sarah's maiden name is Longstreet.