YMMV / One Day at a Time

  • Dawson Casting: Subverted as Mackenzie Phillips and Valerie Bertinelli were both 16 and 15, respectively, when the series first aired. While it was never established how old the Cooper sisters were in the show, the age difference between Phillips and Bertinelli is only five months.
  • Long-Runner Cast Turnover: This series is infamous for the many main cast members and characters coming into and out of the Romano household; almost all of them several episodes into a season.
http://tvtropes.org/pmwiki/pmwiki.php/YMMV/OneDayAtATime