- Jeremy Rowley
- Gary Crenshaw
- Jerry Leggio
- Ted Burns
- Wendi McLendon-Covey
- Joan Hawthrone
- Roger Bart
- Principal Bellingham
- Janeane Garofalo
- Marie Jones
- Kal Penn
- James Merrick
- Kimberly Williams-Paisley
- Susan Merrick
- Liam James
- Solomon Merrick
- Austin P. McKenzie
- Howie Hawthorne
- Sarah Steele
- Diwata Jones
- Skylar Astin
- Walter Healy
- Sarah Baker
- Miss Riggi
- Robert Peters
- Coach Pemberton
- Cristina Franco
- Oksana Poluski
- Anna Margaret
- Casey Thronburn
- Edgar Arreola
- Arnett
- Sara Thomas Easley
- Shy Auditioner
- Spencer Liff
- Choreographer
- Ryan Lee
- Mark Spinetta
- Darren Criss
- Self
- Gregor Patti
- Transcript Boy #1
- David Militello
- Transcript Boy #2
- Angel Giuffria
- Girl in Wheelchair
- Lin-Manuel Miranda
- Genie
- Gideon Glick
- Gideon
- Lucy DeVito
- Lucy
- Nicholas James Reilly
- Holy Ghost Junior
- Amitoz Singh
- Holy Ghost Freshman
- Logan Shroyer
- Hot Debater
- Bryce Romero
- Short Debater
- Karen Beyer
- Persuasive Speaking Judge
- Lester Speight
- Bouncer
- Zachary Salter
- Drag Queen
- Ryan Hooker
- Bartender
- Karen Kaia Livers
- Nurse
- Jennifer Bangs
- Angry Waitress
- Michael Chieffo
- Giles Corey
- Jessy Hughes
- Detention Girl
- Sloane Warren
- Fiona Crenshaw
- Rachel Wulff
- News Reporter
- Caroline Anna-Kaye Green
- Debater
- Kyle Rankin
- Hot Debater
- Caroline Riley
- Student
- Chris Bosarge
- Gabe
- Orlette Cutrer
- Teacher
- Sam Furman
- Student
- Carys Glynne
- Student
- Stuart Greenwell
- Restaurant Patron
- Pixie Hankins
- Restaurant Girl
- Shawn Steven Jones
- Cameraman / Audio Mixer (uncredited)
- Jered Meeks
- News Reporter
- Courtney Middleton
- Teacher
- Mandy Kate Myers
- Parent / Teacher (uncredited)
- Alec Poole
- Guy Dancing in Bar
- George Thagard
- Mayor
- Benny Thrasher
- Student
- Calvin Williams
- Parent
