When Ollie is biting the table in the kitchen, he tears a piece off and chews it. In the next scene, the table is complete and Ollie takes a bite of the same piece again.
At the end of the film, when Piper is riding in the SUV and "hears" the airplane flying overhead, the airplane's wing tip lights are on the wrong sides. Red should be on the left and green on the right for the direction the plane is moving.
When Wendy reads the news article about the missing Connor/Ollie, the URL in the browser's address bar reveals it is a local HTML file (file:///), not a real news website.