The position of Diane Medford's (Gwili Andre) corpse changes position and location in the room in which she was murdered.
When foreign agents Carmela (Amanda Varela) and Valdez (George J. Lewis) arrive to question Tom Lawrence and Miss Brooks about what they might know, they had to walk right past the dead body of Harrington's associate Savitski (André Charlot) without seeing him.
Cliff Clark's police car's front windshield inexplicably has no glass on the driver's side.
In times of war there's a strong censorship on the newspapers in particular about spies. So the script made a mistake by showing,
Nobody seems to be the least bit concerned about getting their own fingerprints all over the murder weapon.
Lefty throws poisonous cigars from the convertible onto the street where anyone could find them and kill themselves by smoking them.