When the Sheriff Dickerson and Deputy Hunt visit Walter Simm's home. The Sheriff looks through the double door's cracked glass windows from the outside. When the Deputy Hunt breaks the door open to enter the house, the door is now a solid single with no windows. You can also notice the room layout does not match with walls outside.
The "Sheriff" Dickerson character wears what appear to be sergeant's chevrons . A County Sheriff, an elected civil authority, is the ranking officer. As such, she should be wearing officer's rank insignia, usually stars, on shoulder tabs as well as on collar points on jackets. Alternatively, she might choose to wear no rank insignia. But never would she wear the chevrons.