Sure: There's no big mystery here. Hollywood just doesn't check continuity very well. Just like they'll show a science paper with a title, "The Mitosis Phase of Cell Division". They just don't care about that level of detail.
I don't think Continuity is the right word. That word generally means that what has happened before isn't contradicted by new information they present in the scene. thus, if I kill Bob in Act 2, scene 3, then unless it's a flashback, Bob can't be shown giving me advice on how to defeat the BBEG in Act 3, scene 2.
This is a whole different problem, namely technical fact checking.
For SotW, if this was a D&D game, the GM would have figured out how fast the party can travel, picked a point 6 days away, and said, that's where you have to go. It's over 40 leagues, and 6 days away, due to the harsh terrain.
Because GMs take the time to get basic facts and terms correct and still fit their end plot goal. Considering the parallels in the job, we could have hoped script writers would do the same courtesy.
Oddly enough, that's another reason why story-driven RPGing is good. Because a narrativist GM is still better than a hollywood script writer.