Revealing mistake: When the alien spacecraft crashes into Big Ben, it is obvious that the shot has been reversed/flipped around. Look at the Roman numerals on Big Ben's clock face: They should read (clockwise from the top) XII, I, II, III, and so. Instead they read IIX, IX, X, etc. (00:06:35)
Revealing mistake: In close-ups of the modified pig, seams are visible on its forelimbs. (00:22:45)
Chosen answer: No, no information is avalible for the identity of the entity.
Repo_Man