When Matt and Ruth are arguing in the kitchen, the clock in the background jumps from 6:39 to 6:18 between shots.
When Matt, Frank and Natalie are eating lunch Frank picks up his drink from Matt's point of view, but from Natalie's point of view a second later he is not holding a drink.
Matt's hair changes between shots during their argument in the living room.
When Matt is eating in the diner, the napkin disappears and reappears underneath the silverware.
When Frank, Natalie and Matt are eating lunch, Natalie picks up a pickle, but in the next shot she is holding her glass in that hand, not the pickle.
There is no Maine Highway Patrol as listed in the credits. It should be Maine State Police.
In several scenes, the Fowlers are drinking Moxie soda, a brand most people think disappeared in the 1950s. It still exists in Maine and a few other locations around northern New England.
During the short scene when Matt is mowing the lawn, the mower is not running. You hear the engine noise on the soundtrack, but the grass isn't being cut and nothing is coming out of the grass chute on the mower.
The camera lens is plainly visible in the shot of Matt Fowler driving in his car.
Ruth buys Marlboro Lights but smokes Marlboro Reds.