Corrected entry: In the scene where Gandalf and Saruman are walking and talking about the Ring being in the Shire all along, there is grass and trees growing, and a corner of the tower of Isengard is seen. However, later in the movie when we see the tower of Isengard, the surrounding area is all charred and black. So where did Gandalf and Saruman go walking?
Correction: Gandalf and Saruman are walking at Isengard long before Saruman ruins the area to create the Uruk Hai. The Ents are drawn into the war because of what Saruman does to the area, including cutting down the trees at the edge of Fangorn Forest.
Nikki