Visible crew/equipment: Set lights are reflected in the metallic parts of Malloy's flashlight.
Other mistake: After Malloy shoots himself his hand does not drop the gun onto the table. Instead, his hand places the gun on the table then his fingers gently shoves the gun out of his hand.
Continuity mistake: Malloy places his flashlight on the floor about a foot and a half away from the door and at an angle. When he opens the door, the flashlight is now right up against the door and directly perpendicular to it.
Continuity mistake: A brick being shoved into place attracts Malloy's attention. The mortar is not neat and tidy, wet, and the bricks are slightly askew. When Malloy turns to face the brick wall, the mortar is neat, dry, and the bricks neatly laid.
Continuity mistake: The size of the matchstick being consumed by the flame varies size as Malloy lights the candles.
Continuity mistake: The shape and number of blood spots on Malloy's left hand change instantly after dripping on him.
Continuity mistake: It is daylight at the front door before Colonel Malloy enters the haunted house, but pitch black when he opens the door and enters.
Revealing mistake: The solid brick wall bends like vinyl when Colonel Malloy touches it.
Continuity mistake: Earlier, Malloy empties his six shot revolver, yet kills himself with a gunshot with no indication he reloaded the weapon.