There Was Another Roommate Before Jack
Yes, you heard it right, before Jack, Chrissy and Janet had another roommate. Before Jack, their roommate was named Eleanor and she actually made an appearance in the episode, Eleanor’s Return. She was played by Miriam Black.
In the episode, her visit to her former apartment actually had Jack a little nervous he would be replaced.
Joyce DeWitt Never Wanted Her Bare Legs Shown
For whatever reason, Joyce DeWitt refused to let her bare legs be revealed while starring on the show. Whether it was modesty or self-consciousness, DeWitt never went without a pair of pantyhose when her legs were being shown.
She was so dedicated to concealing her legs that she even landed an endorsement deal with the pantyhose brand L’eggs!
More Than One Script Was Made During Somer’s Contract Drama
Much of the behind the scenes drama revolved around Somer’s contract debacle. Producers were so vexed by Somer’s demands that, during the negotiation, two scripts were created for the cast.
As in one including the character of Chrissy and one without her!
The Show Had at Least One Famous Fan
Accolades from those already in show business say a lot about the success of a show. Lucille Ball was apparently a big "Three’s Company" fan and even hosted a “best of Three’s Company” show.
Actor Jim Parsons (of "The Big Bang Theory") is also said to be a fan.
There Were a Bunch of Continuity Errors
Unfortunately, it can be easy, with all the busyness of a film set, for show creators to miss important things. There were actually a number of continuity errors on the show, one of which, was pretty significant.
In one scene, Jack has leaves all over him that appear to change color when the camera cuts back to him. There were some other sloppy mistakes such as items on set disappearing between takes.