When Kittis signed his contract with Mrs. Muwela, the shadow of the staff could be seen on the glass behind him.
The height-incline alarm used in police cars was widely used after the 1960s, and the low-incline alarm should be used in the 1930s.
The image inside the camera lens is upside-down, not as correct as seen. The director said that he used the wrong way to better see the picture, but the facts are not as he wanted.
In a scene in the old man’s house, a car made in the 1970s can be seen from the background.
When Kittis waited to meet Yeberton for the second time, he lit a cigarette, then walked into the office, and he took another sip. But when the two shook hands, Kittis' cigarette was gone.
After following Mrs. Muwela, Jack returned home and the phone rang. It was obvious that this could not be the ringtone of a 1937 phone. The voice on the phone is believable, but the ringtone is not possible until at least the 1960s.
There were something in Ida Sayson's wallet, and Kittis flipped through it to find a social security card, in the style of the 1970s in blue and red ink. The real style of 1937 should have only one color, and the shape is not like this.