At the end of the show, Gary Coleman and Todd Bridges are shown standing at Dana Plato's grave. This is impossible since her remains were cremated and the ashes were scattered at sea.
The series is shown as being taped at "Embassy Studios," when no such facility ever existed. The company that produced the series was not known as Embassy until 1982, and it never owned its own studio.
In the establishing shot of the NBC offices in Burbank in 1978, a banner with the ad slogan "Proud as a Peacock" can be seen. The network did not use that slogan until 1979.
In a 1980 scene the song Maneater is played in the background, but Hall and Oates didn't release the song until 1982.