Amateur history geek here. It was less off the mark than Hollywood usually is, but it was a bit overly sympathetic to the Earps. In fact- there weren’t really such clear-cut good and bad guys.
Fred the Sheriff was in fact shot by Curly Bill, but lived long enough to testify in Bill’s behalf at the trial. Fred wasn’t that old, either.
Ike Clanton’s great great grandson lives in Tombstone last I heard, and is something of a celebrity there. Not sure, but I don’t think that Holliday was quite so well educated, either.
Lots of other details are historically wrong, but the essential framework of the story isn’t too far off. It got me to go read up on it, anyway. :-)
From what I have read, Holliday was actually an East Coast Dr. before he developed consumtion (tuberculosis), and moved to the desert for the dry climate...
But, that is just what I recall.
If true, his speaking Latin makes perfect sense.
Also, when he dies, he is recieving last rights from a catholic priest - and if he were an Educated catholic of the time, Latin would be required.
Ete, misse est.