Jack Lemmon's portrayal of Frank Ormand is based on the character Shelley Levene, of whom was played by Lemmon in Glengarry Glen Ross. The character Gil Gunderson, who would be introduced in a later episode, was also based on Levene.
Mindy Simmons appeared in the crowd of employees for the power plant, however Homer explained in the episode "Another Simpsons Clip Show" that she lost her job at the plant after developing a drinking problem. Either Homer made up the "Mindy had a drinking problem" story to get Marge off his back about her, Mindy got clean and sober after getting fired for her alcoholism, or the "Mindy hit the bottle and lost her job" story was a workplace rumor.
During the fight scene between Fat Tony's gang and the Yakuza, the fight initially began with only Fat Tony, Louie, and Legs against the Yakuza. But during the fight an unknown man sporting the same facial features as Legs but with a different hairstyle is seen running past Marge and Homer while they watch the fight.
↑Weinstein, Josh (2006). The Simpsons The Complete Eighth Season DVD commentary for the episode "The Twisted World of Marge Simpson" (DVD). 20th Century Fox.