When Madison removes her nose stud and ear rings you can clearly that her nose is not pierced.
The letter Bob reads at his father's desk before breaking down crying is dated April 7 1988 in which it is stated that Madison just turned two years old. That would make her 20 years old. This does not match the actual character who is a rebellious teenager under her father's care.
After the wolf and her pups are released back to the wild, Madison says she wants to walk back home on her own. It was previously determined to release a wolf far away, which would seem to contradictory to each other.