yeah, I saw that... I'm guessing they got the name from a Ray Bradbury short story... can't remember the name.
Anyway, a travel agency offers hunting.... dinosaurs. They have a special ramp way set up in the passed that doesn't alter or affect anything, and they scout dinosaurs so you can shoot one just as it's about to die anyway.... so nothing is affected along the time line.
but one guy steps off the ramp way and steps on a butterfly. Thinking it's no big deal, he does his thing and goes back only to find that the spelling of words has completely changed. That's it... nothing else, people still talk the same, but the spelling is changed.
Kinda put things into perspective.