Mark Ruffalo (Dan Mulligan), Keira Knightley (Gretta James), Adam Levine (Dave Kohl), Hailee Steinfeld (Violet Mulligan), Catherine Keener (Miriam Hart), James Corden (Steve), Yasiin Bey (Saul) more..., Aya Cash (Jenny), Maddie Corman (Phillis), Karen Pittman (Business Woman), Paul Romero (Bartender), Andrew Sellon (Christian Father), Ed Renninger (Barman), Eric Burton (Singer Songwriter 2), Marco Assante (Marco), Mary Catherine Garrison (Jill), Jen Jacob (Dave Fangirl), Rob Morrow (CEO), Jennifer Li Jackson (Mim), Ian Brodsky (Malcolm), Shannon Maree Walsh (Rachel), David Abeles (Glen), Ann McGowan (Ballet Teacher), Ron Voz (Butler), Cee Lo Green (Troublegum), Kena Onyenjekwe (Troublegum Posse 1 - Rappa DD), Harvey Morris (Troublegum Posse 2 - Phat Jimmy), Terry Lewis (Troublegum Crew Member - Benson), Colin Love (Singing Basketball Player), Jimmy Palumbo (Guy Shouting from Window), Simon Delaney (Lawyer), Danielle Brisebois (Singer), Keen Ruffalo (Keen), Melissa Maria Gonzalez (Chris), Nicholas Daniel Gonzalez (Zach), David Pendleton (Homeless Man), Madison Love (Singer Songwriter 1), Joanna Mauer (On Camera Musician), Erik Detusch (On Camera Musician), Rich Mercurio (On Camera Musician) and others.

John Carney (Writer), Tobin Armbrust (Producer), Anthony Bregman (Producer), Gregg Alexander (Original Music Composer), Yaron Orbach (Director of Photography), Andrew Marcus (Editor), Stephanie DeCourcey (Casting) more..., Jeanne McCarthy (Casting), Chad Keith (Production Design), Anne Goelz (Art Direction),