Goofs

When Elodie interrupts the last wedding, her burn mark switches sides on her chest from her right to her left side.

The length of Elodie's hair changes from long to shorter and back to longer again in the dragon's lair.

Elodie's nails go from very long to very short and back to medium length during the movie.

When Elodie first uses the pomander as a light source (at 1:03:15 to go) the shadows of her hand and pomander can be seen toward the ceiling, which can only happen if the light source is somewhere further behind her and not actually in her hand.

Elodie finds a map drawn on the wall of the cave with the way out. If someone found the way out, would they go back in to draw the map? Think not.

There was another message from V by her corpse saying the perceived exit wasn't safe. It's likely she finished the map before attempting the escape.

There is no need to marry princesses when they just need to grab any common girl and cut her, mingling their blood with them. Why even bother with the marriage hoax? First, this is a fairy tale, and real world logic does not apply. Second, going through with the ceremony makes the brides legal members of the royal family and mingling the blood gives the dragon something to scent.

The rigid metal cage under Elodie's hoop wedding dress has disappeared when she leaves in the carriage and is lifted and thrown into the cave, only to reappear when she gets wedged in a crevice.