Doors can be duplicated by placing them on stairs. The door will be placed, but immediately break, yielding two doors.
Used Kindle Fire
MCPE-1152
Door duplication glitch
Resolved
Cannot Reproduce
0
(Unassigned)
Unconfirmed
Tablet - Android - Other (Specify in description)
door, stairs
0.5.0
Retrieved
Can't reproduce in 0.5.0. They used to do that, now they disappear. Unless kindle fire got an older build somehow... Either way, that should go away in the next update.