When Donna is sitting outside her house, talking to Patton, her mask changes positions. From the front angle, it covers her chin, but from the side angle, it is hanging around her neck.
When Donna starts rushing out, her backpack is open. She turns to speak to Patton, then turns again to leave and her backpack is suddenly closed.
Dr. Loretta tells Larry Jones that she found him by pinging his phone, but he says his battery has died. When a phone is powered down, you can only ping the last cellular tower that it connected to before it powered down, not it's current location. And she couldn't have anticipated him showing up at this funeral home since she doesn't know his route, and he didn't even know what Parish he was in.
After being convinced to take a break by Sebastian, Dr. Wade leaves the room with the dead bodies and enters the "clean" area of her office and sits at her desk. However, she leaves all her PPE on: gloves, lab coat and mask. Any experienced lab person would know to remove said items and wash their hands prior to returning to their desk. As concerned as Dr. Wade appears to be with the Covid outbreak, she should have never made this error as she is potentially contaminating her desk/office.