The car that picks up Harland, the Berents, and Glen Robie at the railroad station in New Mexico also appears in the driveway at the hospital at Warm Springs parked right in front of Harland and Ellen.
Ellen is watching Danny drown and she turns to see Richard coming toward the lake house, which is some distance away. However, when Richard jumps into the lake and begins swimming, Ellen and the boat are very nearby.
At the beginning when Richard arrives at the dock in a motor launch, someone helps tie the bow of the boat to the dock. In the close-up, the stern of the boat magically is tied tightly to the dock.
During Ruth's testimony at the trial, she changes how she holds Richard's book as the camera angle changes.
When Richard sets out after Ellen on her walk that first NIGHT at Rancho Jacinto, the sky is quite light and blue and the clouds totally puffy and white, as in daylight.
When Richard is reading the paper in the typewriter, the word "wisteria" is spelled "wistaria".
During the scene at the fireplace a supposed loon cry is heard. This is NOT a loon, it sounds like a cross between a coyote and a siren.
When Ellen and Richard are arguing in the bedroom shortly after Ellen's family has arrived for their surprise visit, a crew member's shadow moves over the pair on the bottom half of the screen.
(At around 1hr 19 mins) Ellen's shadow can be seen on the left of the frame, so there is a projection screen behind her.
Ellen's method of scattering her father's ashes (flinging the urn from side to side during a horseback ride through the desert) would leave both her and the horse covered in her father's remains.