David Lambert, who plays piano prodigy Brandon Foster, was cast for the role without confirming if he even can play the piano. It turned out he is actually a good pianist.
When Sherri Saum was pregnant with her twins, she thought about naming them Jesus and Mariana. She later then found out they were both boys.
Maia Mitchell and Cierra Ramirez are best friends in real life.
On January 3, 2018, Freeform announced that The Fosters was ending after five seasons. The series is set to conclude with a three-episode finale event to air summer 2018. The finale will also act as an introduction to a spinoff-series starring Cierra Ramirez and Maia Mitchell. The show will start with a thirteen-episode first season and will be set a few years in the future and follow "Callie and Mariana, as they embark on the next phase of their young adult lives.
Sherri Saum (Lena Adams Foster) was pregnant in real life with twin boys around the same time that her character was pregnant on the show. However, the writers have stated that they did not write in the pregnancy due to Saum's real-life condition and that they had planned for that storyline previously.