One ambulance attendant disappears between arriving at the scene and then riding to the hospital, where he is seen once they arrive at Rampart.
Johnny and Roy give a display of their equipment from an older version of their rig, yet drive out on a run in a newer vehicle.
Early's comment to the alcoholic implies that his condition, delirium tremens is a consequence of drinking some kind of rotgut, presumably moonshine (Early suggests he stick to bottles that have labels). Delirium tremens is actually a withdrawal disorder usually caused by stopping ingestion of alcohol after drinking a lot of it, and it rarely appears except in those suffering from alcoholism for years. Any alcoholic drinking can bring on the DTs (when it ends) in an advanced alcoholic.
The writer chose to have Dr. Morton jump to a conclusion about the unconscious hippie (that he used drugs and overdosed). When Morton later apologizes (after Dr. Brackett finds the spider bite), the hippie's friend forgives him, explaining that "we all have our prejudices." Having Morton (who is black) make this mistake serves the series (helping to establish his nature as a young and inexperienced doctor) and his temprament (a bit of a hot head), and at the same time makes a comment about prejudice. A nice bit of writing.