When you see Drake get thrown by the dragon, it is actually a huge doll named Oscar that is being thrown repeatedly, acting as Drake's body double.
Basser the Dragon was created by CGI imaging added in after the actors shot the scene. In order to place him there, several crew were required to hold up a very large blue screen in place at the end of the bridge for the scene to be shot.
Kristin wears 3" heeled black witch boots to play her character Temora the Sorceress. In the scene where she is casting her spells, the last one she slipped on her boot and twisted her ankle, thus makes a sound as she pretends to cast the spell. It was kept in the scene. The closing scene she is seen walking away, very carefully, but with a sprained ankle.