<P> When Duncan arrives back at the beach house, Pam tells him they are leaving with Trent and Steph . Betty and her kids arrive to say their goodbyes . Susanna finally kisses Duncan . When Trent stops for gas on their way out of town, Duncan jumps out of the station wagon and runs to Water Wizz, followed by his mother, then Trent and Steph . Duncan tells Owen and the other employees that he has to leave and tells Owen to follow him . He takes Owen to the Devil's Peak slide, and Duncan becomes the first person to ever pass someone in the water slide while the rest of the park watches . After finally introducing Owen to his mother, Duncan says goodbye to everyone at the park . Owen tells Pam she has a great kid, and introduces himself to Trent as "a good friend of the three". Trent, Steph, Pam and Duncan regroup in the car, where Pam finally stands up for herself as they head out of town . Pam climbs to the way, way back of the car where Duncan is sitting and they share a smile as Trent's protests are heard in the background . </P> <Ul> <Li> Liam James as Duncan </Li> <Li> Steve Carell as Trent Ramsey </Li> <Li> Toni Collette as Pam </Li> <Li> Sam Rockwell as Owen </Li> <Li> AnnaSophia Robb as Susanna Thompson </Li> <Li> Allison Janney as Betty Thompson </Li> <Li> Maya Rudolph as Caitlin </Li> <Li> Rob Corddry as Kip </Li> <Li> Amanda Peet as Joan </Li> <Li> Jim Rash as Lewis </Li> <Li> Nat Faxon as Roddy </Li> <Li> Robert Capron as Kyle </Li> <Li> River Alexander as Peter Thompson </Li> <Li> Ava Deluca - Verley as Katy </Li> <Li> Zoe Levin as Steph Ramsey </Li> </Ul> <Li> Liam James as Duncan </Li> <Li> Steve Carell as Trent Ramsey </Li>

When does the way way back take place