Continuity mistake: When we see Tristan's bird for the first time, the shots changes between close up and distance. In the distance shot you see both of Tristan's arms out in the air, but in the close ups both before and after, it's only one arm out in the air.
Revealing mistake: At the beginning, when the Woads are attacking the Bishop's Carriage, Lancelot is hitting one of the Woads. The sword isn't even touching the Woad.
Visible crew/equipment: When Arthur is riding with his knights in the open field, there's a front shot of the cavalry line. When the camera lowers down to where we can see the legs of the horses, the trail of the camera stage is visible on the ground.
Revealing mistake: In the shot where Guinevere and Arthur are kneeling over the slain Lancelot after the battle with the Saxons, you can see molded rubber soles on Guinevere's shoes.
Factual error: The major Saxon invasion (the one we see in the movie) was set around 400 A.D. After a short time in the film, the battle of Badon Hill starts. This battle is thought to have occurred around 500 A.D. Arthur must be VERY old.
Audio problem: When the Woads attack in the beginning of the movie, after the knights have pretty much won the day, Bors hold up his fist knives, sticks out his tounge, and yells a sort-of war victory yell which sounds rather comedic. At the end of the movie when the knights and their horses charge into the Saxons out of the fog, you can hear Bors' exact same yell once again.
Continuity mistake: In the scene by Arthur's father's grave, Guinevere places her hand on Arthur's cheek. As the camera shot moves from front to back you see her thumb move from on his cheek to off again several times from one shot to the next.
Factual error: The artillery in this movie are counterweight trebuchets, a type powered by a falling weight. The Romans had many spring and torsion powered artillery, such as scorpions, ballistas and catapults, but did not have trebuchets. By the 3rd century BC the Chinese had the "torsion trebuchet", similar to a trebuchet but powered by men hauling on ropes instead of a falling weight; it didn't reach Europe until the late sixth century. The pure counterweight trebuchet as shown in the movie sometime in the fifth century AD probably didn't exist before the late 12th century and the first one in Britain was built in 1216 AD.
Factual error: The Emperor ruled the Roman Empire, not the Pope. Neither he nor one of his bishops would have any authority over Roman provinces or Roman soldiers.
Audio problem: When the Woads are surrounding Arthur and his knights, one of the knight is shouting something, but nothing comes out of his mouth.
Factual error: The scene in which the two armies confront each other on the frozen lake contains several flaws. First, when thick ice is broken with a sharp object like a pickaxe, you merely get a hole through the ice, it will only fragment into large pieces if it is thin. Clearly, this is not the case, as the armies are able to walk on it. Second, ice does not shatter in the way depicted in the film, with cracks travelling outwards a great distance, but just crumbles around the area where force is applied. Third, if cracks did radiate outwards, they would propagate sideways and backwards as well as forwards (like glass does when it is punctured by a small, sharp object), meaning that both armies would end up falling through the ice.
Factual error: Two things are wrong about the trebuchets. While Romans did have siege engines, like the catapult and the ballista, the trenches apparently is a Chinese invention. In any case, it wasn't introduced in Europe until the Middle Ages. Also a trebuchet is a complicated device, much more difficult to operate then it looks. Firing it is easy, but hitting a target certainly isn't. (With modern reconstructions, even when using ballistic calculations, it still takes days of practice to get to a point of some accuracy.) When the Roman army left, the trebuchets were completely useless. In the final battle the Woads nevertheless use them to great effect - impossible.
Visible crew/equipment: In the scene where king Arthur is on a horse walking across a frozen lake, you can see a huddle of camera equipment in the background. The next shot is from that spot.
Revealing mistake: At the start of the film when the Bishops convoy is ambushed by the Woads Arthur stabs his sword at the ambusher, totally missing but the Woad still falls as if stabbed.
Continuity mistake: When Cerdic is about to kill Arthur on the final battle, look at Cerdic's hair which changes position on his forehead during close-ups.
Revealing mistake: Despite at least two days of near blizzard conditions there is never more than a few inches of snow on the ground. The amount of snow we see falling should have left well over a foot of snow.
Continuity mistake: In the shot of Bors (during Venora's singing), Galahad is shown in the back with Gawain being the closest knight to him, a stream directly behind, and a wall far behind. Cut to Lancelot, then to Tristan who is near a wall, then to Galahad with Tristan right behind him and the wall closer.
Audio problem: In the ice battle scene, after the Knights unsuccessfully attempt to make the Saxon army cluster to break the ice, Arthur tells the Knights "It's not going to break". But if you look at Arthur, his lips aren't moving when he says it.
Continuity mistake: When Cerdic calls for the main body of the Saxons to go through the door Cynric is shown drawing his sword, waving it over his head and yelling. In the next shot seconds later his sword is sheathed and he is walking calmly beside his father.
Answer: I don't think it's supposed to be German. Probably Old Saxon. Could be something like "slahten fiand" - slaughter enemy.