 Many of the problems associated with the van that were included in the plot (a broken clutch, a stuck horn, and a detached door), were based on similar problems that writer Arndt experienced during a childhood trip that involved the same type of vehicle.While filming the scenes where the family pushes the van to get it started, a stunt coordinator was used to ensure the safety of the actors.In an interview, actor Greg Kinnear jokingly described how the scenes were filmed when he was driving