Due to the longer production, filming didn't wrap until late July 2013 resulting in the original release date of October 25, 2013 being pushed to January 3, 2014. Making it the only Paranormal Activity film to not be released in the month of October.
(at around 25 mins) In real life, Andrew Jacobs, who plays Jesse, has several tattoos covering his neck, hands and arms - among others. Since all the tattoos were digitally erased in post, the only scene where any one of his tattoos are visible is the scene - before the gangsters jump Jesse - when Jesse is kneeling at the vending machine; you can see a tattoo above his right knee.
at around 4 mins) According to an interview with Jorge Diaz, when he did his scene where his character Hector performs a stunt on a laundry basket, he was supposed to glide down the stairs fast; albeit there was a problem. The basket (that was supported with string to pull it down the stairs, along with a skateboard underneath the basket, which also had its wheels removed) often got stuck in the steps, so finally on the last take someone yanked the string, which brought down the basket and actor to the bottom of the stairs; eliciting Diaz's genuine reaction. This last take was used in the final film.
at around 17 mins) When they are in Anna's apartment after she dies, there is a shot of Jesse standing in front of a mirror. If you look closely, you can see that Jesse's reflection does not match what he is actually doing.
at around 1h 13 mins) When the group is at Grandma Lois' at the end of the film, there are several pieces of furniture underneath sheets. Under one sheet is a shape that looks suspiciously like a little girl (though it is never revealed who it is)