Kristin Dattilo was up for the role of Brenda Walsh, but turned it down. She would later guest star as Melissa Coolidge in an episode of the first season. Beverly Hills, 90210: One Man and a Baby (1991).
In the first season Donna Martin's mother was named 'Nancy Martin' and played by actress Jordana Capra when she was reintroduced in season 2 she was named 'Felice Martin' and was now played by actress Katherine Cannon.
In an episode following the death of Noah's father, Noah is showing Valerie his parents' home. While touring the house, Valerie enters the kitchen wearing a different pair of shoes than in the previous room.