Phillipa Soo as Emma Blair

Simu Liu as Sam Lee

Luke Bracey as Jesse Lerner

Michaela Conlin as Marie

Michael O'Keefe as Colin Blair

Lauren Tom as Ann Blair

Tom Everett Scott as Michael

Beth Broderick as Francine Lerner

Gary Hudson as Joe Lerner

Oona Yaffe as Young Emma

Cooper van Grootel as Young Jesse

Phinehas Yoon as Young Sam

Oceana Matsumoto as Sophie

Gabriella Garcia as Zoey

Kelvin Hodge as Marcus

Jessi Goei as Penny

Jordan Rice as Dylan

Wil Deusner as Tom

Victoria Blade as Ms. Washington

Jay DeVon Johnson as Mr. Williams

Jacinte Blankenship as Ms. Phillips

Christina Bach as Kelly Bach

Steven Anthony Washington as Roger Reynolds

Aaron J. Nelson as Maine Highway Patrol Officer

Ryan Powers as Customer

Bailey Hyneman as Nina

Elijah Harper as Ukelele Kid

Declan Mulvey as Police Officer

Chad Hessler as Police Officer

Hannah Scott as Police Officer

Carlisle Gates as Sam's Orchestra - Cello

Sophie Breitzer as Sam's Orchestra - Cello

Zoe Wesp as Sam's Orchestra - Cello

Ally Smith as Sam's Orchestra - Clarinet

Anlie Williams as Sam's Orchestra - Clarinet

Grace Lyons as Sam's Orchestra - Clarinet

Gwen Edwards as Sam's Orchestra - Flute

Khairi Williams as Sam's Orchestra - Flute

Zoe McGrath as Sam's Orchestra - Flute

Jack Powley as Sam's Orchestra - French Horn

Laura Waldeck as Sam's Orchestra - French Horn

Hannah Robinson as Sam's Orchestra - Trumpet

Erin Tinerella as Sam's Orchestra - Tuba

Hope Ingling as Sam's Orchestra - Viola

Nyia Barrow as Sam's Orchestra - Viola

EC Cobb-Curtis as Sam's Orchestra - Viola, Violin

Cayleigh McClendon as Sam's Orchestra - Violin

Colby Collins-Peterson as Sam's Orchestra - Violin

Isabel de Andrade as Sam's Orchestra - Violin

Isabella Garcia as Sam's Orchestra - Violin

Aidan Shepard as Sam's Orchestra - Guitar

Jack Fishback as Sam's Orchestra - Guitar

Kinsey Boston as Sam's Orchestra - Guitar

Xan Dauvray as Sam's Orchestra - Bass

Trenice Atkinson as Sam's Orchestra - Bass

Brendan Coffey as Sam's Orchestra - Drums

Kathryn Crowley as Sam's Orchestra - Drums, Violin

Ty Respus as Police Officer (uncredited)

Gabrielle Newton as Wedding Guest (uncredited)

Mary Clare Mitchell as Ukulele Mom