In the first shot of Angela and Jill, Angela's bangs are on her forehead. In the next, they are brushed to the side.
During the Larks initiation meeting, the way Stacy is sitting changes between shots.
If Stacy Lockwood's funeral was Catholic, it would be unlikely the priest would wear a green stole and the casket covered in purple. Catholic priests normally wear a violet, black or white stole during a funeral mass. Caskets will, in most cases, be covered in white, however they can be open. Caskets cannot be covered with a flag of the deceased's nationality while in the church. However, when the casket leaves the church the flag can be put back on the casket.
At Angela's and Jamie's confirmation ceremony, the parish priest is administering the sacrament. A parish priest would not normally administer this sacrament to young people who are receiving confirmation at the normal age: a bishop would administer confirmation. Parish priests only administer the sacrament of confirmation to converts, and only then when no bishop is available.
At Stacy's funeral, the liturgical colors are incorrect. Assuming that it is a Roman Catholic funeral, the priest should be wearing a black stole and the cloth draping over the casket should also be black. Instead, the priest is wearing a green stole and the cloth is purple. Even if this scene was not intended to depict a Catholic funeral, the colors are still inconsistent. Any Christian denomination using liturgical colors would not combine the colors green (ordinary time) and purple (seasons of penance) in the same liturgy, funeral or not.
When the judge is explaining the difference between first degree and second degree murder the camera pans to Angela's mother she only has one earring on. It is in her left ear, there is no earring in her right.
When, Angela is cleaning off the knife she used to kill Stacy she never cleaned it off thoroughly with soap and water as well as disinfectant. She only cleaned it off with just water and didn't get all the blood off before wiping it off with a towel, this means the knife still has Stacy's DNA all over it and still a lot of bacteria on it.