For example, Rapunzel was an adult in the story but lived in tower in both versions. This shows that there was not a huge difference within movie & story. This is important because in the movie Rapunzel was just turning 18.
Also, Rapunzel had twins with the kings son but in movie there was no kings son there was only a criminal. This shows that the story of Rapunzel back then had mature and non-childish creators. This is important because none of the twins and pregnancy