Erika Flores' final appearance as Colleen Cooper.
Medical doctors were often called "Bones" or "Saw Bones" at one time. This was why Dr. McCoy was frequently called "Bones" in Star Trek. The visiting doctor in this episode was called Dr. Bones for other reasons.
Dr. Porter goes by the name Dr. Bones. Captain Kirk called Dr. McCoy "Bones". When Dr. Porter found Loren's doorstop, he called it "the real McCoy." This is an inside joke.
Sully is smoking.
Maude was Sully's mother-in-law.