When Bill is cutting the picture of Chip out of the magazine, he only makes one cut between his legs, but in the next shot there are two cuts between Chip's legs.
When Jess is at the hospital with Bill, her hair changes from being draped over her
right ear to being tucked behind her ear and back again repeatedly between shots.
While discussing the details of the doughnut franchise with Jim and Jane Whittman, Bill takes two bites of a doughnut. When the angle changes at the end of the scene, there is only one bite in it.
The movie takes place in Minnesota. Bill and The Kid stop to buy fireworks at the Fireworks Supermarket. It is illegal to purchase fireworks in the state of Minnesota.
In the scene where John Sr., John Jr and Bill are talking to the French people and John Jr is translating, he makes translation errors. "Son-in-law" is not "faux bil", it's "beau fils" (pronounced Bow Fee-s).