One I noticed right of the bat, is that Dolphins still do not interact with items dropped underwater.

 When a mob is hit with a thrown the trident, the trident disappears. (not enchanted.)

 The animation for the Bubble Columns does not look right. (Don't know if this is intended, just something to check.)

This one is just a suggestion, but can you put the normal pumpkin (not carved) into the creative menu? Edit: I didn't realize that it pops up when you search for it, but I think you guys should put it next to the carved pumpkin.

If there is anything else you want me to test, just comment.

To be updated!