User blog comment:SuperStrawHatSaiyan/Are You Gonna Fix It, Toei?/@comment-34981281-20130107045624/@comment-3119203-20130109063332

I'm going to have to disagree with you here, but I think that this issue is more of "I choose to see this, and you choose to see that." I think that with the examples I've shown, Luffy can choose where to activate Gear Second.

As for the anime discrepancies......I don't watch the anime, but I do remember seeing the episode where Luffy wrecked the pacifista. I'm pretty sure he used his arm as a pump, activating Gear Second on that arm.