In the beginning of the movie when Vinessa Shaw's character is leaving a message for medication, she gives a 5-digit NPI (National Provider Identification) number. Real NPI numbers are 10 digits long.
Near the end, when Alex kicks the door open to the bedroom that Jane is hiding in. The tape holding the door latch in is visible..
When Jane looks at the text Miles just sent her the audience sees that it was sent at 6.46p while the one she sends shows 8.41p showing a plot hole in the time.