Theory:Doctor Who television discontinuity and plot holes/Death Is the Only Answer


 * When Albert Einstein turned into an Ood he had a translation sphere in his hand; if Einstein's liquid had transformed him biologically into an Ood, shouldn't he have had a hind brain rather than the technical replacement?


 * The transformation could have been timey-wimey rather than a biological transformation; Einstein's timeline could have been replaced with that of a technologically-augmented Ood. The liquid having time-affecting properties would make sense, since Einstein had made it for his time machine.


 * Einstein might also have swapped places with an Ood which had been elsewhere in the universe; in this case the Ood wouldn't have been Einstein, just a regular red-eyed Ood (in Einstein's clothes.