Martha Kent (Annette O'Toole) and Perry White (Michael McKean) are actually married in real life.
Perry White utters the famous catch phrase, "Great Caesar's Ghost!". In the comics, this is Perry's favorite expression he uses when things are not going well.
In the comics, Martha and Perry have never shared a romantic relationship, due to the fact Perry is married to Alice White, and Jonathan Kent died only recently.
Lois calls Perry "Chief", which is a nickname that Jimmy and Lois use in the comics to irritate him into a frenzy as a running gag. Perry usually responds by saying, "Don't call me Chief".
This is not the first time that Annette O'Toole and Michael McKean have played a couple on a television series. They did so in season ten (1999-2000) of Law and Order in the episode "Mega", and also in the season six finale of Boy Meets World.