Continuity mistake: In one of the fighting scenes Legolas is ready for battle, but when you look at him first his hair is behind his shoulders the next camera shot showed his hair perfectly laid out in front of his shoulders, then the next shot his hair is back behind his shoulders again.
Continuity mistake: During Aragorn's speech to his army at the black gates, the direction the flags on the spears blow constantly changes. When we see him from behind facing them, they blow to his right, and when we see him in the POV from within the crowd, they are blowing to his left.
Continuity mistake: When Frodo is in Shelob's lair, before actually seeing her, there is a semi close-up of a bird swinging about upside-down in the webs. There is thick webbing that stretches from the bird's body to the tip of its beak, but in the next close-up the webbing only reaches halfway down its beak.
Continuity mistake: In the previous movie Oliphaunts make sounds similar to real-life elephants. However, in this movie, they sound entirely different.
Answer: There are only five wizards. Saruman and Gandalf are heavily involved, as we see. Radagast, while not mentioned in the film, has a particular affinity with the birds and animals - it is he who sends the Eagles to the last battle, and to rescue Gandalf from Isengard. The final two, Alatar and Pallando, known as the Blue Wizards, went into the far eastern regions of Middle-Earth and never returned. Tolkien felt that they would ultimately have fallen from grace, much as Saruman did.
Tailkinker ★