How Do/Would You Know?

I was reading some of the reviews/theories on the story of "Wild Grass" and there are a few. But, something that struck me about one was the following -

The Dentist/Pilot was death. & The little girl at the end represented reincarnation.

While the movie dragged, there was a narrative. If you followed the narrative you were being shown, there was no reason to dig for much deeper meaning.

If you're an average or above average viewer, how would you know this? How would you figure these things out?
 
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