Goofs

The bite Claire takes out of the apple is gone when she forces Norman to take a bite out of it.

When the pickup truck first crashes in the water, it stalls and the headlights go out. In the next scene, they are on again. Besides a continuity error, this implies an unusually waterproof electrical system.

During the final sequence, Claire is obviously wearing dark red or pink underwear underneath her night gown. Later on, they turn white.

During the sequence when Claire is in the tub supposedly unable to move, her head is higher and lower in relation to the back edge of the tub in different shots.

When the picture with the newspaper breaks the first time, Claire puts the glass into a bin piece by piece. There is still one piece on the picture when she puts it back on the table.

When Claire's friend visits her early in the movie, she brings her a pouch of "Kombucha mushroom tea". Kombucha has been used in Europe for centuries, and gained popularity in the U.S. in the 1980s. It's black tea semi-fermented by the kibosh fungus, which floats on the top of the tea, growing thicker as it eats the tannins in the tea and the sugar that you add, producing the distinct "zingy" taste of kibosh after 2 to 4 weeks. In the movie, it's portrayed as a simple dry tea, not a disc-shaped commensal colony of bacteria and yeast. that must be kept alive.

Michelle Pfeiffer dives into water to retrieve a box but after taking it into the house she's dry in next to know time. The same happens when she gets out of the bath.

All of the vehicles in the movie have Vermont plates, but no visible inspection stickers. They are supposed to be in the top center of the windshield, behind the rear-view mirror.

The picture that keeps breaking is a newspaper clipping of the same celebration that Madison attended. While the clipping reports the search to be "intensifying" and Madison didn't go missing for three days, the report could have been from a weekly newspaper.

The ghost fogs the mirrors in the bathroom, yet Claire sticks her arm in the tub and is not scalded. The fog, being ghostly, need not have been caused by hot water.

When Claire is in the bath she turns the water tap counter-clockwise by pulling on the shower line. While that would normally open a tap, in some older plumbing it does not.

When Claire finds the tub filled with water (both times), it is completely filled. While the overflow drain would not have normally permitted this (and while the second time, it has filled abnormally fast and quietly), it's a ghostly event, which means some of the normal laws of nature are suspended.

When Claire is looking up missing persons and comes across Madison Elizabeth Frank, her details are to the left of the screen and her picture is to the right. When she hands the page to her husband, the picture is on the left and the info is on the right. The page may have had a "format for printing" option.

After the seance, Claire's friend leaves, and Claire closes the front door. But the door remains open (just out of view), while Clair moves her hand (also just out of view) in the motion of closing a door, and the sound of a door closing is played.

When Claire walks into the bedroom for the first time, she passes a mirror. A cameraman's reflection appears for a split second.

Adamant, Vermont is mentioned twice. Both times it's described as being "down 7", meaning southward on US Route 7, the principal north-south artery on Vermont's western edge. Route 7 passes through the Burlington/Lake Champlain area where the movie is set. Adamant is about 40 miles east of Route 7.

It seems unlikely that Norman or Claire would be able to dial 911. Only 30 of Vermont's 250 towns have 911 service. Residents in rural areas, like Norman and Claire's town, have to dial 7 or 11 digits to call for emergency services.