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The WB advertised this episode as the season finale, not the series finale.
When Nanny Anna trips Maria (the second time; at the end of the episode), you can see the boom mike above their heads when the camera-man gets a shot of the two of them (when Maria screams "Whoa!").
In episode #4 Maria "The Maid" is holding a Vase and about to smash when Adam Ridgeway walks in. The vase she is raised above her head to smash and the vase she lowers when Adam walks in changes. At the end of the episode the vase she smashes is the same one she originally had in her hands.
Mindy Cohn, who plays Maggie "The Cook" also starred in The Facts of Life