Doc, Kitty, and Festus had always been listed together in the end credits on one title card, following James Arness's single-credit title card. Here, however, only Milburn Stone and Amanda Blake are listed on the second card. Ken Curtis is listed on the third card with Roger Ewing, with the font used for Curtis's credit still the same size as that used for Stone and Blake (slightly smaller than for Arness but larger than for Ewing). This "two and two listing" will be used whenever all four actors appear together.
While Doc is treating Jeb, Matt goes to the fireplace. The hand that digs around appears to be that of a black actor. Perhaps, Arness wasn't available for that shot.