Yes, the name of the town is ONE OF the central plot points. Red has to remember it in order to find Andy at the end (as was comically depicted in the Family Guy episode where he doesn't remember it). So it ultimately has incredible significance to the storyline.
The names of other towns in the story are rather insignificant by comparison because none of the plot is focused on them as much.
Which town it was in Mexico (or anywhere, for that matter) isn't relevant. The fact that he had to remember the name of the town, however, IS very much relevant - and since it has a greater relevance, it's not "a minor insignificant fact" for anyone to remember it.