Nini's song "All I Want" was inspired by Olivia Rodrigo's own Instagram feed, where she posts original compositions. Olivia wrote the song in less than a week.
Joe Serafini (Seb) plays the piano live throughout the series. Seb was only supposed to appear in two episodes.
Dara Renee twisted her knee in rehearsal for "Truth, Justice, and Songs in Our Key," right before they were going to shoot the big song. Larry Saperstein stepped in, learned her part of the dance in about 15 minutes.
At age five, Sofia Wylie won an online contest to attend the red carpet premiere of "High School Musical 3," long before she started acting professionally and starred in the Disney Channel hit series "Andi Mack."
Dara Renee's "Bop to the Top" solo wasn't in the initial version of the script. It's sung a cappella because of lack of time to record with musicians and Dara arranged this version of the song herself.