Continuity mistake: When King Theoden is lying under his horse, when Eowyn starts to battle the Witch King, he has spots of mud on his right cheek that are very clear. After Eowyn has slain the Witch King the spots on Theoden's face are now faint smudges. After he dies and she leans down to hug him, the spots are now as they appeared in the first shot. (02:09:20 - 02:15:45)
Continuity mistake: In the previous movie Oliphaunts make sounds similar to real-life elephants. However, in this movie, they sound entirely different.
Revealing mistake: When Gandalf is riding to the top of Minas Tirith, watch the second level carefully. You can see a background character (I think it's a soldier) disappear twice as Gandalf rides past. (00:42:50)
Other mistake: After Gollum attacks Frodo and Sam on Mount Doom, Sam fights Gollum off with his sword. He then turns around and calls out for Frodo. There is a brief medium shot of Frodo scrambling up the mountain (at about 01:20:35 on disk 2 of special edition). If you look carefully in the background, you can see snow and running water in the background. This is common on Mt. Ruapehu, where the scene was shot, but a bit out of place on Mt. Doom. (01:20:35)
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 ★