(at around 48 mins) When young Olive finds the fossilized Triceratops, she is supposedly given an Arabian stallion. The horse in question is quite obviously neither an Arabian, nor a stallion.
Olive tells Emerson Cod that the nuns are sequestered, however she says this in Cod's office. Therefore, they are not sequestered.
Olive states, when told Sister Larue was murdered, that there are commandments and "we follow all 10 around here." There are 613 commandments in the bible. While the general public may know of only the first ten, a postulant nun should know that there are more than ten, even if she hasn't memorized them all.