After dumping Daley in the desert, Vance and Tess drive off in red pick up, yet as they enter the town, the shot out of the front wind screen clearly shows the green bonnet of the Land Rover, the interior shot then shows them back in the Red pick up before another front shot, this time clearly showing the bonnet, and dash board of the Land Rover once again.
when Tess and Sean want to descend into the cave they discovered, a rope ladder is thrown in. In the next scene you see Tess climbing down the ladder, with the ladder bolted or attached in someway to the floor of the cave.
The Templar knights are shown abandoning ship in a storm and then wading ashore wearing full chain mail and a sword. Swords are heavy and chain mail is heavier. Nobody would be able to float wearing them so would have had to get rid of them quickly or drown.
It is claimed that the astrolabe was set to the position of the wreck at the time of the sinking. In order for an astrolabe to be used the stars must be visible - this is not generally the case in a wild, ship-sinking storm.
The Catholic Church did not begin persecuting the Templars until about 100 years after the fall of Acre. In 1291 they were still on good terms with the Pope.
There was no Ottoman Empire in 1291. State of Ottoman was founded in 1299 in a very small area in south Marmara district.
Templar Knights as well as all knights did not wear their armor and chain mail except when anticipating battle or possibly a formal ceremony. The Templar knights on board the sailing ship in the storm would not be wearing the chain mail. The chain mail of the type shown in this movie would have weighed 80-100 pounds and the knights could not have survived in the water during the storm. They would have drowned immediately had they really been wearing their mail.
The language spoken as Turkish in the film is more commonly known as gibberish.
When Tess climbs down the ladder to join Sean, the ladder is actually locked to the ground whereas Sean couldn't lock it. Furthermore, she climb the ladder face to face, not as it should be climbed, sideways.
When the Templars are washed ashore they are supposed to be on Ottoman territory. It is known that the crusaders fought Saladin and the Arabs and not the ottoman turks who will appear in the area at least 100 years later.
In a scene of the siege of Jerusalem what appears to be a cannon is seen on the ramparts. In 1291 cannons had yet to be invented in Europe.
The Templars would not have been speaking American English; the Americas were more than 300 years off being discovered by Columbus.
It's said that the Templars left Jerusalem, boarded the ship and watched the city burn. But the city of Jerusalem is some 27 miles (43 km) from the sea.
During the battle for Jerusalem, the Templar knights are shown escaping the city by river. Jerusalem is a landlocked mountain city surrounded by desert; there is no river by which to leave it.
Bodrum is one the most popular tourist areas in Turkey, with its light blue beaches. In the movie it's shown as if they are in Saudi Arabia - there's no desert at all in Turkey.
The location that the movie was made in to represent Bodrum, Turkey looks nothing like the actual place. The actual place is mostly covered by forests and beaches along the Mediterranean. It has a full services international airport and even the most recognizable feature of the area, houses painted white, is never even shown.
The backstory relates that the surviving Templars watched Jerusalem burn from the deck of their ship. Jerusalem is 40 miles inland from the sea. At another point,Tess says that the ship departed from Acre. Acre is 80 miles north of Jerusalem.
The buried town at Fontsalis has no visible features from the ground yet various windows in the church show daylight coming through. This means the roof must be above ground level and therefore visible.