Minecraft Beta 1.0.1
A strange, unintended feature appeared in 1.0.1 that wasn't in 1.0: water became slightly more transparent when viewed from above. This wasn't in the patch notes, and Notch never acknowledged it. In Beta 1.0.2 (released two days later), it was reverted.
: It sits between the transition from Alpha (December 2010) and the Full Release (November 2011). minecraft beta 1.0.1