When Maura's legs fall through the ceiling from the attic, she kicks her legs repeatedly, losing both shoes. When she's pulled back up into the attic, she is seen barefoot but has her heels back when she falls completely through a second time, though she did not go downstairs to retrieve them.
At the beginning of the movie, when Maura was applying sunscreen to the perceived homeless man on the corner, she had the bottle at her feet as he was walking away and she was yelling for him to give the sunscreen back to her so she could give it to a proper homeless person.
At Big Lots, several blue first-aid kits are bought. During a later scene, there is one blue first-aid kit and one white Target private-label kit on the table. Since the house was cleared of items before the sisters came home, this could not have been there. Also, the private-brand kit didn't exist when the girls would have lived there, so they couldn't have gotten it from their room.
Putting blue paint into the pool strainer may have allowed blue paint in to the pool, but would not have caused the sprinklers to spray bluish water when they came on late in the movie.
Kate could not have climbed out of the sinkhole the way she did. Florida soil is soft and sandy; not solid rock. She would have kept sliding back down.
The Orlando Police officers wear dark-blue uniforms, not tan ones like in the film. The OPD patches they wore are also incorrect. They used to wear brown uniforms but switched to blue in the late 1980s.
The Orlando Police cars in the film have an incorrect paint job.
at 1:07:23 an earpiece is visible.