Tamazula de Gordiano
Okay, I've seen this movie at least 10 times and it just occurred to me that in the beginning of the movie it says that Isabel is in Central Mexico visiting her great-grandmother. I looked up the location of Tamazula (which is where Alex says he is going, which is actually Tamazula de Gordiano, Jalisco, Mexico) and the distance to Las Vegas, and it is definitely not drivable! It would take at least a week to drive there! And somehow Alex makes it in one day? And Isabel makes that trip a few times a year in that old truck? I think not!
Anyway, I love this movie regardless!