Carol gives the backboard back to the paramedics, and then after when Carter is with the gunshot victim, the backboard is seen under the victim.
When Dr. Lewis is getting ready to shock the patient having a heart attack just before the ceiling collapses and the air conditioner repair man falls through it, the orange AED pads on the heart attack victim change positions in between shots.
When the AC technician falls through the ceiling onto the patient, you can clearly see that it's a dummy on the gurney.
When the unconscious drunk is brought in, at one point one of the paramedics says, "He's puking," and someone else says "Roll him," but the team continues with CPR. He's never rolled and doesn't vomit.