I really like how Derrek went out. Hard, fast, and completely out of his control while he was trying to save someone's life. That's one of the best ways for a hero to go down.
I also like that we pretty much have confirmation that Weaver is working against Skynet, apparently trying to build someone who can battle Skynet one-on-one. She was definitely the T-1000 we saw in the future scenes; opposed to Skynet and wanting to help save humanity, but unwilling to side with Connor's army.
And yeah, the "...but you can't sing" line got a hard chuckle out of me.