Chrissy's hairstyle before, during, and after the "Turkey" episode taping.
When Allan is trying to convince the ABC exec's that Suzanne would be perfect to play Jack Trippers wife, the hall tree that is by the double doors keeps disappearing and reappearing.
When Suzanne Somers fires her manager and is two weeks late for the start of the new Three's Company season is said to take place in July/August 1979. The on air sign reads that it is the start of Season Five when in fact it should be Season Four.
The final scene of the show was filled with many mistakes. First of all, Terri/Priscilla was the one who turned out the apartment light and close the door, not Jack/John. Also, the movie shows the apartment number to be 291, not 201 which is what it was on the show.
In a scene set during the 1978-79 season, an ABC executive says that "CHiPs" is NBC's only hit. That was only the network's third highest-rated program that year, behind "Little House on the Prairie" and "Real People."
In the movie, John is approached by Ted Bergmann about the spin-off "Three's a Crowd" right after season seven ends. However, John wasn't told about the spin-off until later on in season eight when the ratings began to fall.
When the producers introduce the idea of the Ropers being spun-off Norman Fell is hesitant but he agrees to it in less than two minutes, in real life Fell didn't agree to it until six months later.
In a scene depicted on November 20, 1980, while Suzanne is being escorted out the studio after filming her first "Chrissy tag," she walks by a group of women standing in line waiting to audition for the role of Cindy Snow. Among them is Jenilee Harrison who was ultimately cast in the role. Later, in a scene depicted in early 1981, Jenilee is seen leaving the green room wearing the same wardrobe she had on at her audition.
The actors are using mobile telephones in cars and on the set in 1979. Mobile phones weren't mass produced until 1983.
The Thighmaster that Alan shows Suzanne when telling her about the opportunity to be a spokesperson, is a Thighmaster Gold, which was not produced until much later. The original Thighmaster was blue with a red center.
As Suzanne picks up the paper on her front lawn, the articles inside read "How Dumb is Anna Nicole" and "Love in the Fast Lane for Ben and J.Lo"
A late model full size Chevy van can be seen in the background during a scene that is supposed to take place in 1977.
Fred Silverman had actually left his position at ABC in 1978 to leave for NBC, yet he was featured in much of the 1979/80 troubles with the show.