No mention of the Two Towers movie is complete without noting the stark difference between the book Ents and the Jackson "Ents".

In the book, the Ents are prompted by encountering Merry and Pippin to deliberate about how to deal with the increasing problem posed by Saruman. They are well-aware of how his orcs have been destroying their trees, and though their inclination is to seek seclusion as they have done for thousands of years, they recognize that there is no escape from the spreading evil--in part because of the arrival of the hobbits which makes it manifestly clear that the world is changing--and resolve, in record time (for Ents), to march forth to war though they know not whether it means their own deaths.

In the movie, the Ents have no idea what is happening to their own forest despite supposedly being stewards of it, decide not to do anything about Saruman, and then are tricked by Merry and Pippin into walking into part of Fangorn Forest that Saruman's destroyed. Instantly enraged (and somehow mysteriously close to the border), they charge to attack with no forethought or plan and in direct contradiction to their multiple-day deliberation.

It fits very well with the common movie trope of only extreme, uncontrollable, spontaneous emotion being useful in overcoming any serious challenge. But as an adaptation of the original, you could hardly pick a more disgraceful treatment. The march of the Ents is one of the most powerful statements of moral clarity in the whole book, and Jackson turned it into a toddler-level temper tantrum.

I like a lot of other things about the movie, but this I do not like in the least.