When the series began, Bay (Vanessa Marano) and Daphne (Katie Leclerc) were both supposed to be 15 (consequent to the show's premise, the characters share the same birthday). In reality Marano was 18 and Leclerc was 24, but their birthdays are less than a week apart.
Even though Meredith Baxter plays Lea Thompson's mother she's only 14 years older then her. Both women have also played Michael J Fox's mother, Meredith Baxter in Family Ties and Lea Thompson in the Back to the Future Trilogy.
In Switched at Birth, Vanessa Marano plays Bay, a girl who did a science project and found out that she is switched at birth. In Gilmore girls, she plays April, a girl who did a science project and found out that Luke Danes was her father
Vanessa Marano (Bay Kennish) has a sister named Laura Marano who is also an actress. Laura has never acted in Switched at Birth, but when Vanessa was asked to bring in photos of herself for the set, she brought in photos of both her and her sister. In season 4 episode 17 - "Girl With Death Mask (She Plays Alone)" - Bay visits her cousin, and he shows her a picture of her deceased, biological aunt. Laura is the aunt in the picture.
Max Lloyd-Jones and Sean Berdy first collaborated together in The Sandlot 2. Sean Berdy would later portray the role of Emmett Bledsoe, one of the main characters on Switched at Birth, and Max Lloyd-Jones would later portray the role of Noah, a recurring character in season 2a of Switched at Birth.
The trivia items below may give away important plot points.
Melody (Marlee Matlin) opposes Emmett's relationship with Bay, because she believes that a hearing person cannot truly love and relate to a deaf person. In Children of a Lesser God (1986), Sarah (Matlin's Academy Award-winning feature film debut role) faced similar deaf-community opposition because of her relationship with a hearing man.