Revealing: In one scene, when Tom Cruise is in the dungeon talking to the fairy, you can clearly see that the "fairy" is nothing more than a light on a thin piece of wire. The wire can be seen quite clearly for 2 shots.

Revealing: The 2 unicorns are stallion and mare in the movie. But both horses used were clearly stallions. This can be seen quite well when the "mare" is jumping around after she comes upon the stallion with his horn removed; full shot of the male horse anatomy.