Question: Lana Shields became a regular cast member then she disappeared from show without any explanation, why?
Answer: John Ritter also said in interviews that there was no way that Jack would continue to resist Lana's advances since she was attractive and Jack was notoriously sex-crazed, so that could have been a factor as well.
Question: How can Jack, Janet and Chrissy confuse Ralph Furley's furniture with Mr. Roper's? They have been to Mr. Roper's apartment so many times that they should have known that furniture was not Mr. Roper's.
Answer: In addition to the other answer submitted, don't forget - the trio hadn't met Furley yet at that point nor did they know The New Landlord had moved in yet so it would make sense if they thought it was Roper's furniture (even if it was unfamiliar to them).
Answer: As the Ropers were the landlords, it's possible they kept unused furniture in the building storeroom or an unrented apartment (or so Jack might have assumed).
Answer: No official explanation was given for why the Lana Shields character was abruptly written out after a handful of episodes. Ann Wedgeworth, the actress who played Lana, said she was never given a reason, but according to Wedgeworth's daughter, her late mother was unhappy playing a one-dimensional character that had little development potential. The daughter said Wedgeworth and the Three's Company producers came to a mutual agreement for her to leave the show.
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