Tim McIntire was the son of John McIntire and Jeanette Nolan.
This was the final episode to feature Charles Bickford in the opening credits; he had passed away two months before it aired.
According to Wikipedia, Scarlet fever is a disease which can occur as a result of a group A streptococcus (group A strep) infection. The signs and symptoms include a sore throat, fever, headaches, swollen lymph nodes, and a characteristic rash. The rash is red and feels like sandpaper and the tongue may be red and bumpy.
While there us no composer credit, the scoring for this episode is very much in the style of Leonard Rosenman. This is especially appropriate to this story as he is credited with scoring 152 episodes of the WW2 military series, "Combat! (1962)".