There are errors on Frank Olins' death certificate. The typed date of death is May 10 (with the year omitted); however, the handwritten date the attending physician (Craig) "last saw the person alive" is July 8, 1946. The time of death is typed in as 7 p.m., but the execution took place at 8 p.m. The entry for "Maiden name of mother" lists only "Bertha" instead of her full maiden name.
As shown on the EKG machine in the doctor's office, Olins had no heartbeat, so there was no way for the methylene blue to circulate and be effective as it was being administered by a gravity drip IV.
The floor in the apartment hallway runs directly into the open elevator with no break or threshold.
Dr. Craig, Margot, and Jim are stopped at a police roadblock on a lonely, dark road. When they leave, there is a cut-back to the inside of the car; the view through the back window shows they are still in the well-lit city with no roadblock behind them.
When Joe walks into the bar, he pauses by the piano. The piano player raises his left hand off the keyboard to wave to Joe, but the piano music continues as if both his hands are still playing.
Right at the beginning, when Dr Craig's reflection is seen on the mirror, the dark line behind him is a shadow from either the camera or a boom mic, as it moves when the camera pulls away.
Margot claims to have grown up in Lancashire, England, but her voice has no trace of a Lancastrian accent; it is rather that of someone from the south-east of England.
In Dr. Craig's office, when his nurse is walking toward him and expressing concern about his decision to abandon his practice for the weekend, the shadow of the boom microphone can be seen crossing the cloth screen next to the nurse.
As the camera dollies up on Sgt. Portugal as he reads the note taken from the money box, the shadow of the boom microphone can be seen to go across his face.
When Dr. Craig is sitting at his desk, a wedding ring can be seen on his left hand.