Anyone who plays guitar could tell that Dr. Kelso WAS actually playing.
In response to Elliot's questions, Dr. Kelso gives a fake history about his musical past. The details are taken from Elvis Presley's life and death. And one detail Kelso presents: "Then in 1977, i died on the toilet... or did I?" This is a reference to Elvis's dying while seated on a toilet at the time of his death. Also a reference to minor conspiracy theories that Elvis was still alive.
J.D.'s girl names: Tinkerbell and Betty.