They also had a third stage using a "green" monopropellant, instead of the horribly toxic hydrazine. AFAIK this is the first of its kind to be used on a rocket, although there has been test satellites before using "green" propellants. The advantage is that it's really simple to use by being a monopropellant like hydrazine, but its much safer to handle than hydrazine (workers need full body protective gear to handle hydrazine).
On an related note, Falcon heavy is scheduled to launch in a few days. If the launch is successful, it would be the largest rocket currently in operation.