There was also a whole episode built around Mary staying home sick from work. Sue Ann comes over and makes her "good" food ("no pizza") which she quickly takes from Rhoda
Mary was also fired from her job for a brief period in a season four episode.
In this episode, when asked how long she's worked at WJM, Mary responds, "7 years, never absent, never late." But she has been both of those a few times over the series; for example, in "Assistant Wanted, Female", Mary is one hour late due to Phyllis. She is also late in the episode "Where There's Smoke, There's Rhoda from season 2. Rhoda's apartment catches fire and her and Mary end up being late for work.
Lou: Mary, I think you deserve a raise as much as I deserve one.
Mary: Oh, thank you, Mr. Grant.
Lou: But I can't get one. And do you know why I can't? Because you're so good.
Mary: I'm not sure I understand that.
Lou: If I go upstairs and threaten to quit, why, they'd just let me quit. Because they know they still got you! Same thing if you threaten to quit. They'd still got me.
Mary: You're saying the reason we can't get raises is because we do our jobs so well?
Lou: That's right. If we were both incompetent, we'd have them over a barrel.
This episode was filmed on July 16, 1976.
First appearance of Mel Price, the enigmatic station manager who wrecked havoc with much aplomb in season seven.