Continuity mistake: On the river, her lover has a cigarette, then there's a cut to Hela's mother, and when we see her lover again, the cigarette is gone.
Continuity mistake: When Hela's mother goes out of the house to meet her lover, she has a hat. In the next shot it's gone and is not seen around.
Continuity mistake: When Hela climbs out of her window, as she opens it she is wearing a long sleeve shirt. Then when she runs into the street she is suddenly wearing a green top and a skirt, but when she arrives at the place she was running to, she's wearing a white dress with a white shirt.