Joseph Gordon-Levitt

Ethan

Seth Rogen

Isaac

Anthony Mackie

Chris

Lizzy Caplan

Diana

Jillian Bell

Betsy

Mindy Kaling

Sarah

Michael Shannon

Mr. Green

Lorraine Toussaint

Mrs. Roberts

Randall Park

Boss

Ilana Glazer

Rebecca Grinch

Nathan Fielder

Joshua

Heléne Yorke

Cindy

Aaron Hill

Tommy Owens

Tracy Morgan

Narrator / Santa

Darrie Lawrence

Nana

James Franco

Self

Miley Cyrus

Self

Kamal Angelo Bolden

Kamal

Baron Davis

Self

Chuck Muckle

Piano Playing Uncle

Curt Bouril

Cindy's Husband

Brooke Liddell

Cindy's Daugher

Kiley Liddell

Cindy's Daughter

Jason Mantzoukas

Bad Santa #1

Jason Jones

Bad Santa #2

Clem Cheung

Deli Owner

Harolyn Blackwell

Opera Singer

Natalie Knepp

Coat Check Girl

Cameron Earl Thrift

Singing Kid

Jeremy Vimes

Hunan Waiter

Gabriel Long

Karaoke Singer #1

Michaela Sprague

Isaac's Daughter

Euan Morton

Coat Check Patron

Marilyn O'Connell

Old Lady

Richard Hughes

Train Conductor

Theodora Miranne

Woman

Nicola Fiore

Exotic Dancer (uncredited)

Aly Mang

Party Attendee & Pro Athlete Girlfriend (uncredited)

Marija Skangale

Snow Globe Dancer (uncredited)

Bill Walters

Christmas Bartender (uncredited)

Hannah Townsend

Tommy's Hot Girl (uncredited)

Oliver Solomon

Karaoke Singer #1 (uncredited)