When Ian Conroy is in the diner talking with the cult leaders, he quotes a verse from the Bible, saying it is "John 1:8." The verse quoted is actually from 1 John 1:8. Forgetting to say "First" puts the reference in a different book.
When Ian goes undercover, they insert a camera in his neck for surveillance. When he is "baptized" the second his head goes in the water the camera dies. A camera designed to work inside the body (60% water) should not be affected when the outside of the body is submerged in water. Human bodies & skin do not absorb water from the outside.