Minecraft wiki entry for Development_versions, associated text: MC-110510 – Evokers can see through walls.
MC-122327 – No longer able to place buttons or levers on pistons.
MC-129205 – Cannot target blocks underneath of cauldrons through the cauldron.
MC-132313 – Buttons and levers can be placed on the bottom of hoppers.
MC-146357 – Vines cannot exist on the sides of glass or stained glass, but can on other transparent blocks.