Revealing mistake: The size of the spider walking off Sam's face becomes disproportionately smaller too fast compared to its size while on her cheek plus the spider's awkward movements are indicative of CGI. (00:02:20)
Continuity mistake: The laceration near Ryan's right eye extends into his cheekbone but it is much shorter and looks closer to his eye several minutes later. (00:08:30 - 00:13:55)