People with emergency medicine experience will tell you that on the great drama ER, people healed much faster than in real life. At the same time, they were accurate on medical details that helped me suspend disbelief. Indeed, they were using some of the latest techniques only a couple of months after publication in a journal.
In "Wounded Warriors of the Sexual Revolution", I'm also adjusting time for dramatic reasons. No, I don't expect an ankle fracture to heal in a couple of weeks. This is even more true when rehabilitating a previously near-comatose neurological patient. I am, however, accurate that singing and music are recent innovations in speech therapy, and, in fact, weren't around in the rough time frame of the story.
Do I need to have a disclaimer/clarification other than in the Prologue? Should I have a note in the chapter where the quick cures appear?