A grown man is still caught in the crossfire of his parents' 15 year divorce. He discovers he was unknowingly part of a study on divorced children and is enlisted in a follow-up years later, which wreaks new havoc on his family.
| Actor | Role |
|---|---|
 Adam ScottCarter Spencer | Carter Spencer |
 Richard JenkinsHugh | Hugh |
 Catherine O'HaraMelissa | Melissa |
 Amy PoehlerSondra | Sondra |
 Mary Elizabeth WinsteadLauren Stinger | Lauren Stinger |
 Clark DukeTrey | Trey |
 Ken HowardGary | Gary |
| VValerie TianKieko | Kieko |
 Jessica AlbaMichelle | Michelle |
 Jane LynchDr. Judith | Dr. Judith |
 Adam PallyMark | Mark |
 Vickie EngMrs. Kobayashi | Mrs. Kobayashi |
 Greyson ChadwickCrying Waitress (uncredited) | Crying Waitress (uncredited) |
 Sarah BurnsMargo | Margo |
 Jamie RenellTyler | Tyler |
 Valerie PaytonEtta | Etta |
| GGavin LuckettEmily | Emily |
 Vince CanlasMr. Kobayashi | Mr. Kobayashi |
| TTodd DensonMaitre d' | Maitre d' |
 Brian KurlanderDavid | David |
 Sarah VowellLorraine | Lorraine |
 Steve CoulterCharles | Charles |
| DDavid KronawitterLawyer | Lawyer |
| LLeland L. JonesFire Chief | Fire Chief |
 Claire BronsonCynthia | Cynthia |
 Andrea MooreCoat Check Girl | Coat Check Girl |
 Trevor Scott StandishYoung Carter | Young Carter |
 Frank RobertsJewelry Shop Owner | Jewelry Shop Owner |
| GGregory BromfieldWaiter (uncredited) | Waiter (uncredited) |
 Michael H. ColeTed (uncredited) | Ted (uncredited) |