In the ambulance, Mills begins one hand CPR, but his hand is too low on the patient. When the camera angle changes, his hand is higher up in the proper position.
Brittany when leaving gets on the wrong bus. The announcement over the PA was for the bus to Jacksonville, Tampa, and Orlando. Bus service from Chicago to Jacksonville does not go to Tallahassee, it diverts from I-75 to 1-10 and goes away from Tallahassee. Bus service to Tallahassee takes a route further to the west.
Casey tells Dawson another Battalion Chief (Lionel Jones) was on scene of the hydrochloric acid leak. Lionel Jones is a Deputy District Chief (as depicted by the two bulges on the front of his hat), not a Battalion Chief.