When Detective Rickey and Brody arrive at Mona Lannon's building, they find her apartment by seeing her the name on the door. But on the following cut, after the servant opens the door, there is now only a number on the door.
When Detective Rickey is on the fire escape and lands on the ground; there is a man in the background who is walking out of an alley and then stops to see what is going on. But on the next cut after Brody, who just arrived through the front entrance, joins Rickey; this same man repeats the same action of walking out of an alley and then stopping.
When Winslow is in the cab and tells the driver to step on it; she is seated behind the front passenger side. But on a following cut when the cab pulls out of an alley; she is now seated behind the driver's side.
When Flavin brings in a tray of drinks to serve Mona and Donald; Flavin sets the tray on a table then hands them the drinks. But on the next immediate cut when the Detectives break-in; the drinks are still on the tray.
When Winslow calls Rickey from Flavin's office, she is holding the phone with her right hand and the "Last Will" document with her left. But on the following cut when Flavin appears and questions her, it is reverse. She is now holding the phone with the left hand and the document with her right.
Millard Lannon got shot in the back however there was no damage to his clothes nor any signs of an entrance wound on his body.
When Detective Rickey and Brody are in their car chasing the cab; they are both wearing hats and no one is wearing glasses. But on a medium shot of the speeding car; both stunt doubles are wearing glasses or protection goggles and only the driver is wearing a hat.
When Mryna goes to the Montequito Apartments looking for Donald Norton, his name is on the row of door buzzer buttons and mailboxes, but there are no apartment numbers. So how does she know which apartment to go to?
In the first scene, a newsboy hawks newspapers by barking out the hot new story in the "just out" extra edition. In every other movie of this era, such a hot headline would be splashed across the front page in huge typeface. In this film, the article about the Lannon custody case is on page three, next to "Bill Aids Owner on Foreclosure." If the Lannon case was newsworthy enough to print an extra edition of the paper, it should have been at the top of page one.
The score, which is played only intermittently, does not match the character of the picture. It is played by a full symphonic orchestra and is composed in a pseudo 19th century classical romantic style.
Mona Lannon provided her telephone number to Norton's servant who gave it to Private Detective Myrna Winslow and then to her own servant who gave it to Police Detective Rickey. She, however, did not give out the address. Rickey was able to secure the address by making an official police request to trace the number. The film, however, does not explain how Mona was able to find the address even before the police.
As Mona Lannon ran out of the house feeling distraught, a gunshot rang out. Mona, however, did not stop to see what happened. Later that evening Mona is hiding out in a hotel. It is understandable running from a gunshot but there's no explanation as to why she didn't report the gunshot and why she went into hiding since there's was no way of her knowing that her ex-husband got killed or was shooting at her or committed suicide or that she was under investigation for his murder.
When Flavin catches Winslow in his office; she is in the middle of speaking with Detective Rickey. As Flavin approaches her, she hangs up the phone. She just told Detective Rickey that Flavin is the killer and that she was calling from his office. It, therefore, makes no sense for her to hang up the phone. By keeping the line open, the cops would have been automatically aware of what was happening and would have then rushed to her rescue.
As Jim and Brady go to leave the room to go question Mona, a moving shadow of the boom microphone is visible on the door to the right as they exit.