In this episode, the roommates borrow a cot from the Ropers for Eleanor to sleep on during her stay. But in almost every other episode where there was company, Jack slept on the couch and the company in his bed.
(after Larry streaks)
Janet: What was that all about Jack?
Jack: About what? I didn't say anything.
Mrs.Roper: (running to Jack's door) Encore Larry! Encore! Encore!
In the first episode, Elanor has a baby. However, there is no kid with Elanor and not even any mention of her child.
This is the only time in the series we see Janet and Chrissy's old roommate Eleanor. She would, however, continue to be mentioned from time to time.