You can place a banner on a boat,but you won't be able to see it.Also snow golems that get killed by witches won't drop heads, but snow golems without pumpkin will drop it instead.These 2 features work in 1.10 version but not in 1.11

Can confirm both, and can confirm that the snow golem drops the head only if has not the pumpkin.

Seems like that EntitySnowman.isPumpkinEquipped() works as intended, and not backwards

I can't reproduce the first.

Nevermind. I figured it out. There's two methods with the same mcp name but they have different names after compiled.

Next time please leave each bug on its own issue, it makes it a lot easier to sort through.