How come they didn't add Nedra Volez to the opening credits she was on there from 1980-1982

Nedra Voltz was a "recurring character" during the 1980-1981 and 1981-1982 seasons, mainly because her contract gave her a certain amount of episodes to work with...many episodes in those seasons are Adelaine-less.

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Andrew Carden

Did Todd Bridges and Dana Plato get reguler credits in the last couple of seasons when they were not always in it?

I think Todd was still in the opening credits, but that last season it would say at the end of the episode

Special Guest: Dana Plato

Willis was in all of the opening credits.
Dana was in the opening credits from season 1 to 6.
Adelade wasn't in them because they didn't know if Mrs. Garrett would be staying with the Facts of Life. She would have come back if the Facts of life was cancelled.

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"Whatchoo talking about Willis?"