Blue Lips the goldfish clearly doesn't have his blue lips in scenes that aren't a closeup, such as when the boyfriend does an impromptu puppet show in the beginning.
Jeff's British accent is inconsistent at best.
Somehow, cutting her own hair with one small mirror and simple scissors gives Mona a perfectly-executed and coiffed short hairstyle complete with texturing and product.
There is no blood soaking through the sides or bottom of the box. This is especially noticeable since they exaggerated the amount of blood that would come out of a skull wound.
Generally speaking, highly pregnant people do NOT sleep on their backs. The pressure to their lower backs and bladders makes it highly uncomfortable.