Plot hole: The spell Magicae Maxima works, but it shouldn't have worked at all because there was one ingredient missing, the petrified spider.
Plot hole: The incantation for Magicae Maxima must be repeated 7 times without making a mistake, or they have to start over. Winnie says the spell wrong but the spell works anyways. The first time she says it (with Book), Winnie says "From North, the East, the South, the West," but the last time she says it (without Book), she says "From North, South, East and West" (not in the right order).
