Continuity mistake: In the beginning of the movie, students pour out from the school. Margaret and Johnny walk up to Janet and Billy by passing between two tall boys making them apart. In the next shot, the boys are walking side by side behind them. (00:09:50)
Continuity mistake: Hatchet marks are already visible on the door when Vic Nottingham arrives to chop through it.
Continuity mistake: The red napkin in Ed Warren's hand disappears and reappears several times while he sits at the breakfast table.
Continuity mistake: In the middle of the movie during a non ghost activity kitchen shot the Pyrex bowl on the top shelf moves slightly from one shot to the next. You can see the full frontal pattern in majority of the movie, however, it moves slightly, revealing where there is no pattern visible on the bowl.
Answer: Valak was portrayed as a particularly powerful demon. In horror films demons are often portrayed as overconfident, and in this case it was thinking that Lorraine Warren would not be powerful enough to be able to defeat it. In addition, Valak revealed their name while Lorraine was in a dreamlike trance state, so it may have believed that she might not remember or make the connection at any point and be able to use it to her advantage.
dewinela