Guido Brother makes a good point I think. It's not presumptuous to put 5003 even when we know it could be 5000 or 5006 when checked; it's just full disclosure.
Regarding names of races or courses, I sincerely doubt we could all agree on where to draw a line. Let's use our own judgement as to when to push the organizers to change their name, when to put the distance in quotes, and when to leave the name issue alone.
Thinking about "full disclosure" reminds me that Bob Letson at one point resolved to put ALL the measurement information on his maps-- calibration numbers, counter readings etc. Small print of course but right there on the map where anybody could check the math. (For those who don't know, Bob was one of the early pioneers of measuring, guided by Ted Corbitt, and among other accomplishments he produced some of the finest hand-drawn course maps around.)