When Erik is showing a page to Hanna with profiles of girls at Utrax, The order of the girls changes between one scene and another. The top two girls are the same, but girls 242 and 217 have swapped places.
Erik mentions they must have put up fences, as they weren't there before. But the fences look very old and rusted.
Jules' pierced ear lobes (3 holes visible).
After Marissa shoots Sawyer dead, when she retrieves his phone several minutes later, his nostrils can be seen flaring with his breathing.