Goofs

When Mary picks up to drink the coffee Mrs. Thomas gave her, the mug is full. Very next shot, right before she sips it, it's empty.

When Mary falls into her trance the night she is playing the organ alone in church, we see that she is playing the organ's pedals with her bare feet. However, when the minister interrupts her playing and fires her, and she gets up from the organ to leave the church, she is wearing black loafers. Then when she steps outside the front steps to meet the waiting neighbor guy, she is wearing white heels.

When John and Mary are sitting on the couch, in one shot his hands are close to his body, but in the very next shot, they are on the couch; close to Mary.

When Mary is first given the tour of her rental room, she is wearing black loafers. However, when she picks her luggage up from the floor when Mrs. Thomas leaves, she is wearing white high-heels.

In the department store where Mary discovers she is "invisible", she goes down an aisle with both hands out to her sides and clearly has no purse. The scene cuts to her leaving the store where she now has her purse.

When Mary is driving from Kansas to Utah, she passes by the Saltair II first before reaching Salt Lake. The Saltair would have been seen after passing Salt Lake City while continuing westbound.

In the auto repair shop scene, to get her transmission fixed, Mary stays inside her car when it is raised on the car-lift (that is a violation of safety rules). When Mary gets a panic attack, she locks both of the front doors. But a little later, she accidentally falls out of the passenger side door, even though she had locked it.

The organ Mary plays after the accident is clearly a church organ, but the organ sounds like a theater organ. While this is possible with modern organs, at that time, a church organ and a theater organ would have very different sets of pipes. A theater organ can sound like a church organ, but the reverse would not have been true at that time.

The coffee cups are translucent when the neighbor brings coffee which reveals that only an inch has been poured in each and that they're not drinking.

Before Mary gets into her car, the ignition key is in the start position. After Mary climbs in to start it, it's in the off position.

Mary Henry's hair is dry and blows in the breeze right after she has supposedly climbed out of the water.

Many of the long shots were looped in the crowd scene following the accident, and other shots were dubbed with the audio track from other shots with which they were intercut. The audio and the mouth movements of the actors drift in and out of sync across the various shots in this scene.

Mary Henry's footfalls don't match her on-screen steps as she dashes into and through the bus depot.

When Mary Henry plays the organ, her finger and foot actions do not match the organ music on the soundtrack.

The camera crew is reflected in the boys' car during the drag race.

When Mary is in the fitting room in the department store, the face of a crew member appears reflected in the mirror, between her hair.

The service station garage, supposedly in Utah, has a poster on its wall advertising a sports show on TV station WIBW in Topeka, Kansas. (Whilst it's generally true that broadcast stations west of the Mississippi River have call letters beginning with "K" instead of "W," WIBW is an actual station which still carries the same call letters today.)