On the whole, it was a very faithful adaptation.
Seuss himself called the short the most faithful adaptation of his work.
Illusion it was, though: there's no such thing as a truly faithful adaptation.
The 1963 version is a relatively faithful adaptation and received critical praise.
While this film also takes some liberties with the original text, it is in the main a more faithful adaptation.
The idea was to make a totally authentic and faithful adaptation of the character's best cases.
The series was a faithful adaptation of many events from the book and it often relied on very similar, if not exact, dialogue.
The story is a faithful adaptation of the novel, retaining its 1962 setting.
The film was considered a faithful adaptation of Lawrence's story.
Anyway, a faithful adaptation of this particular book is impossible for obvious reasons, so why try?