Corrected entry: When Laura is escaping from the beach house we see her putting on a wig and then lifting a roll of bank notes from her bag. During the film it is clear she doesn't work so she has obviously saved money for her escape. How, then, is she managing to pay for her mother's upkeep in the nursing home without her husband knowing? The part-time library job that's mentioned wouldn't pay nearly enough.
Corrected entry: Laura tells Ben that she moved to Iowa to be near her mother who's in a nursing home, but she hasn't seen her yet. Ben asks why, and she replies that she's not sure it's safe. Why would Laura say this when she's trying to keep her identity and situation a secret?
Corrected entry: Martin returns to the empty beach house to looks for clues about Laura's disappearance. While there, he goes through boxes of Laura's papers. But why would these boxes be at the beach house, instead of at the couple's main house in Boston? Or why would he cart them all the way to Cape Cod when he could just look at them in the main house?
Corrected entry: After Laura is presumed dead, her husband receives a call from the woman at the YWCA to offer her condolences. This is what tips him off to the fact that she planned her "death". But how would the woman know Laura's real name, let alone her home phone number? Laura was always careful to travel under an alias after she left her husband. It seems unlikely that she would give her true identity and home phone number to the organization where she covertly took the swimming and self-defense classes that ultimately helped her fake her death.
Corrected entry: Laura cuts off her hair before putting on the wig. But when she gets to Iowa it's practically the same length it was before.