When Sam gets out of the car that he is supposed to be driving to find Molly he gets out of the back door instead of the driver's door.
Jonas pulls up the hood of his protective suit, then dons his respirator. It is impossible to get a proper seal this way. The respirator must be donned, then the hood is raised, and the rim of the hood covers the edges of the respirator to ensure integrity.
Sullivan is referred to as "Sergeant" but has been a Warrant Officer since joining the show. Described as a Warrant Officer 1 but also incorrectly called "Chief Warrant Officer."