Springfield, IL has no Marriott Hotel. There is a Residence Inn, a Courtyard Inn, and a Fairfield Inn. (None of which have the facilities shown!)
Near the beginning, Jimmy is about 30 minutes late according to the wall clock seen shortly after he arrived (8:30 or so). Since he was not expected to report for shift, a replacement paramedic would have been found and been present, yet when the call came in right after that, he and Brett respond to the call. No replacement paramedic was seen, which would have left the ambulance crew short.