First of all, all the options say they're activated by the triangle button. Since I'm playing on the PC, that obviously isn't right, and even if this were the PS3, I'm pretty sure triangle doesn't do everything. Just a minor quibble since I already know the controls by heart.
Also, I was in the secret underground spoilery area full of spoilery things I probably shouldn't mention yet, and I Rhinoplastied Max, and he vanished after he changed back. He's still THERE, and his gun amusingly hovers there in mid-air when I try to shoot at other spoilery things, but his model has vanished.