Visible crew/equipment: During the scene when Audrey is having a nightmare about eating too much while on vacation, the nightmare ends with her inflating like a balloon from all the food. Her shirt splits open and down the middle, where the buttons have broken, and you can see the black balloon used for the effect.

Continuity: When the Griswalds are leaving the hotel in London they get in the hire car. When Clarke realises that the steering wheel is on the other side he gets out. When Ellen gets out she leaves her door open but when Clarke goes to get in the door is closed.

Factual error: In the "Pig in the poke" show, the final question - regarding the Lewis and Clark expedition - sounds: "What lieutenant led that expedition?" However William Clark was not lieutenant - he was captain.

Other: In the beginning of the movie when Clark is preparing to light the Bar-B-Q, He squirts charcoal fluid out of a plastic bottle. Then Ellen squirts more fluid onto the coals out of the same plastic bottle. Listen to the sound; it is the distinctive sound of a metal charcoal lighter fluid bottle.