After Golda comes in on the fire truck, Dimsdale's oldest daughter walked out of the kitchen wearing black shoes. When she walks back in the kitchen they are white.
Henry falls out of Monica's hotel window late at night, but the prolonged outdoor chase scene that immediately follows when he lands on a horse takes place in bright sunlight.
When Dimsdale stops the VW to pick up the last child there is a tree immediately behind the car. When everyone piles back into the car the tree is missing and there is a playground swing in the background.
Upon reaching home the daughter announces dinner is ready. Dimsdale then learns that there are not enough chops so he goes to the store where he finds the money. After he returns home the ladies are shown still making dinner.
The family is stopped for an agricultural inspection as they enter Arizona, but in reality the inspections were held when you entered California, not left it.
When Henry is posing as a waiter, he's making a Caesar salad with iceberg instead of romaine. The kitchen would never have given him the wrong lettuce.
When Dimsdale takes the carton of milk out of the grocery bag it is already open.
When Henry picks up his eldest daughter and eldest son at a drive-in food stand, a group of kids bob as if listening to music, but there's no music playing.
Dimsdale leaves his western jacket in Monica's hotel room when he climbs out the window. But when he falls on the horse, and all through the horse/golf cart chase scene, he has it.
At the laundromat, Henry is obviously pulling dry clothes from the washing machine.
When Dimsdale is standing and talking to his girlfriend in the living room of the house he and the children are hiding in, you can see all the children in the backyard playing. The dining room is also visible and you can see a man in a dark suit sitting at the dining room table. The man is obviously not a part of the movie.
(At 33:46 > 34:18) The shadow of a boom mic can be seen on the white wall past Bob's shoulder.