Towards the end of the Beaumont party scene, Alex and the security guys are in the hallway with the killer statues. One of the security men falls to the floor and his earpiece falls off. Throughout the scene, it keeps changing position from being on the floor next to him, to back on his ear, to being on his ear in a different position.
Security is trying to help Alex escape. Each security guard is using a semi-automatic pistol, and when the clips are empty, the gun is heard to be making a double click sound. No semi-automatic pistol will make a double clicking noise when the slide is drawn back, as these are shown to be, when the clip is empty.
Merritt makes two wishes - for his statue to become more valuable, and for money, both of which the Djinn grants. However, with the exception of the waker, the Djinn can only grant one wish per person.
When the security guard orders the Djinn to leave, he goes away with discontent, but then the guard says that would love to see how Djinn'd go through him. Djinn fulfills the desire. But this is impossible, as ordinary people have the right for only one wish. The first was fulfilled when the genie was gone. To go through a security guard - is the second wish.
The goof item below may give away important plot points.
After the explosion in the laboratory, Josh is laying on the floor, injured. His face is covered in blood, however during the scene the amount of blood on his face keeps changing. In close ups of his face his lips are free of blood, but in wider shots his lips are covered in thick amounts of blood.