When Dr. Sheldon Hawkes is watching the Jennifer Lopez video and having his Chinese food take-out, Mac Taylor comes in and jokes about how eating is frowned upon. During that time, Dr. Hawkes is holding just a piece of meat on his chopsticks, but in the next shot there's a piece of vegetable on it, too.
When they are taking the burn victim to the hospital, in one scene the EMT inserts an endotracheal tube into the patient's mouth. Two different shots later you can see the ET tube out of the mouth with the EMT bagging.
When the lye victim arrests in the back of the ambulance, Hawkes orders the EMT to intubate. The paramedic starts the process but never completes it. While Hawkes pumps the victim's chest, the EMT is seen holding the endotracheal tube beside the patient's mouth.