Lucas is stated as a minor, yet the very last scene of the heart monitor, they have him listed on it as an adult.
Before the accident, you can see Lucas is wearing his seatbelt. When Dan was pulling Lucas out of the car he wasn't wearing the seatbelt.
At the end of the episode the heart monitor says "Asystole", then they start to shock him...... you can't use the paddles when someone is in asystole.
When Dan comes to the cafe to say to Deb that he needs to come home, you can hear someone say "No" before Deb says no, like some one off screen is saying it.
When Dan takes Lucas to the hospital, the doctor asks if Dan is his legal guardian to give consent so they can do surgery. In an emergency, consent is not needed even for a minor.