After Walter Brent knocks the lamp over, starting a fire, Mary Malden brings a lantern from the kitchen and places it on the end table where the lamp had been. A few minutes later, however, when she brings the tea tray, the table is on its side and Jim Wilson hurries to right it before she trips on it.
During a night scene, chickens are moving about outside. Chickens don't come out at night.
When Jim Wilson delivers Tucker to the police station and then walks away, shadows of people are cast on him (among them, someone wearing a hat), although in the next shot the street is totally empty.
Wilson and the Sheriff are stopped on the bridge discussing the crime. When the car begins to move, a reflector known as a "Shiny Board" can be seen in the reflection of the side window. It's clear enough to see it's the "Soft Side" of the board being used.