Goofs

During the struggle in the shower with Marek and his wife, her hair goes back and forth from wet, dry, then back to wet again.

When Kit and her father hear car radio news report of murder while making late night drive back from Libby's house, landscape appears to be in full daylight even though earlier night scenes don't suggest there is any significant moonlight.

The broken glass shower door changes between scenes.

When David Mannering telephones the police, he confirms Sgt. Harris' question if he is "the Mr. Mannering in Oakland Hill." The radio news reporter says that it is Oakland Hills. The address on Ellie Mannering's car registration states that they live in Springton.

When Judith Merak crashes through the glass after the shower murder it's not a stunt double, it's a dummy..

After Amy hangs up the telephone in her eavesdropping on Steve and "Suzette"'s call, the camera is solely on Amy in the bedroom. For a fraction of a second, Amy disappears from the frame, then reappears.

Every time a car starts off or comes to a stop, they added a grinding gear sound. Even if all the cars had manual transmissions with non-synchromesh 1st gear, one would only grind the gears before accelerating, not after accelerating or coming to a stop.

When Kit & Libby go outside to find Tess, they pause right outside the door. In the interior of the house, there is shadow of a person moving inside the house.

The camera crews shadow can be seen on the wall of the house after the murderer is shot.