Some other stuff: in the book, Edmund hears all about Aslan before he leaves the Beaver's house. So, when he arrives at the palace of the White Witch, when he draws glasses and a mustache on the stone lion, he's mocking Aslan as he does so. In the movie, this apparently doesn't happen, and the scene where Edmund draws on the stone lion is done while he's silent.
Also, when Edmund is thrown into the dungeon in the palace, Mr. Tumnus is there with him. In the book, Tumnus has already been turned to stone, and walking into the palace Edmund passes, "a sad looking fawn."
They also omitted Aslan's return to the palace of the White Witch while the battle is going on. In the book there's a chapter about how Aslan frees the stone people and animals, employs the assistance of a giant, and I *think* gets some of the dwarves to fight on his side.
I can also say that if you've read the entire book series, there's a few things they did in the movie that set up information for sequels: on the professor's desk is a silver apple snuff box, and the carvings on the wardrobe are of intertwined apple trees - these dovetail nicely into the story outlined in "The Magician's Nephew".
[Edit]: Here's another: the first time Peter uses his sword is to kill the wolf... In the book and in the movie, Aslan says: "clean your sword." But in the book, there's actually blood and fur on the sword to clean. 😛