User blog comment:Suparockr/List of Plotholes throughout the series/@comment-2249774-20120723213353/@comment-4950455-20120725013720

To be honest, that's not a bad thing - giving fans the pieces to fill in the gaps has long been a key technique in building an internally consistent universe without wasting too much effort on minutiae.

The problem comes when there aren't enough pieces in the first place.