The arm that Glaeken reaches out with to kiss Eva for the first time.
When Dr. Cuza confronts Molasar with the talisman. Molasar holds out his right arm when he threatens to return him to the diseased state he found him in and slay him and his daughter. Then, after Dr. Cuza's speech, Molasar is now holding out his left arm when he reverts him back to his old, arthritic, self.
The Einsatzkommondos of the SS always wore field grey Waffen-SS uniforms, not the black parade jacket with swastika armband as depicted in the film.
When the two soldiers are ripping the cross from the wall you can see the whole 'stone' wall flexing.
One of the German soldiers who opens the tomb accidentally nudges a fake boulder which slides away way to easily.
When Dr Cuza is translating the writing on the wall, he says "The form is the imperative" i.e. that it's a command. That's taken from the source novel, where the writing is translated as "Strangers, leave my home!" But in the film the translation is "I will be free", which is not an imperative statement.
The soldiers who remove the first cross are wearing 1941 Russian Winter Campaign medals in their button-holes, yet the film is set before this campaign took place.
Not only are the black SS uniforms incorrect, as they were never worn in the field and were replaced by the army field-gray in 1939, but the SS men wear them with black ties on brown shirts. The brown shirt, which symbolized the SS as part of the SA, was discarded in 1934 after the Night of the Long Knives and replaced with a white shirt with the black uniform.
Camera assistant visible directing a camera pan when the German soldiers are firing into the air when the evil force is released.
The villagers' clothes as well as the outward paintings on the church indicate Bukovina region in Moldavia as the location, as does Cuza's address in Jassy (where Jews and Gypsies were really arrested at the time). However, the priest Mihai speaks of roundups in Brasov, which is in Transylvania.
The writing on the wall is in a modified Cyrillic alphabet, not Glagolitic as Dr. Cuza identifies it.