Revealing mistake: Director's Cut Only: After Godfrey's party has been attacked in the woods, a surviving noble is executed by the sergeant. We see his axe strike from behind, then the shot cuts to show the face of the noble as the sergeant pulls the axe out and off-camera. As the noble slumps forwards, the axe reappears in frame from below and it can be seen that the axe has no forward point, allowing it to be placed against the head of the actor playing the noble as if embedded. (00:29:25)
Revealing mistake: When the Muslim emissary arrives to Jerusalem and Guy de Lusignan stabs him under the chin, look at the blood. It bursts from something attached to his shoulder. In addition, the emissary is seen as stabbed with a small dagger but then Guy De Lusignan is shown holding a full length blood tipped sword a second later.
Revealing mistake: The shields carried by the crusader extras in the marching and pre-battle scenes, etc. are all made from the same casting. Some differ, but the majority have identical battle damage, gouges and slashes.
Answer: I thought it was cotton with oil of clove for a bad tooth.