Goofs

Alexander Nevsky's helmet changes several times from one with eye protectors (looking like glasses) to one with just a nose protector.

(at around 1h 16 mins) Alexander rides forward challenging the German Master to a duel while holding a lance. The German draws his sword, then there is a cut back to Alexander holding an ax. When they charge and joust, they both are using lances. Then they duel with Alexander using a sword, then switching back to an ax.

As Olga helps her two suitors, Gavrilo and Vasili, from the battlefield, each is walking beside her supported by her in the middle with their outer hands empty. The next shot from the rear shows that Vasili has acquired a sword that he uses as a walking stick to assist him.

Vasilisa's braids appear and disappear when she is being armed and dressed in chain mail.

When the request in made for rope to bind the people of Novgorod, the person making the request places himself between the Teutonic Grand Master and the seated religious figure with his front to the crowd. The next scene shows him with his back to the crowd and having moved a little distance from the seated figure.

Gavrila Alexich, one of the movie's main protagonists, could not participate in the Battle of Ice. He was killed one year before it, in 1241, storming the fortress of Koporye.

The cross displayed on the shields borne by the Teutonic knights is different in shape and colour to the actual one on their coat of arms.

The shield with the eagle, displayed on the flag of the Teutonic Order in the 13th century, which is held by the fighters in Novgorod, looks slightly different than the real one, especially due to the form of his wings. In the movie he resembles the German Reich eagle.

As the Teutonic Knights flounder in the icy water, the blocks of "ice" are obviously made of wood with the grain and joints plainly visible.