Note : This is my first time reporting any error so I apologize if it isn't great.

I was using snapshot 13w38c when I noticed a couple of things.
1. Pumpkins and a mushroom tree spawning in a very mini forest / plain biome.
2. The bonus chest contained several diamonds. I think it is only supposed to contain minors like at the most a stone tool.
3. I couldn't mine the azure bluet flower with anything. It only broke.
4. The sunflower occasionally didn't break both blocks.
I tested all except issue three in creative mode.