He had a few things off actually
On things that I saw that were good were the Boots of Swiftness, the Frozen Phage and the Sunfire Cape
I would have finished that Garen build with Thornmail and a few random items depending on the situation and enemies that Im up against.
Thats the difference between experienced people and people who follow cookie cutter builds. Im sure that Garen just followed some silly build isntead of changing it depending on the enemies