The Wedding of River Song - S6-E14
Factual error: During the zoom-out from Earth at the end, the Sun is depicted as far, far too large than it actually appears from Earth. (00:40:03)
The Wedding of River Song - S6-E14
Continuity mistake: When River sits down by the table as she and Amy are talking and drinking wine, in shots of River, Amy's wineglass is sitting on the corner of the table. In shots of Amy, the glass is first absent, then Amy reaches over, grabs it and takes a sip before resting it on the table with her hand holding the stem, whereas her hand is in her lap in shots of River. (00:40:40)
The Wedding of River Song - S6-E14
Other mistake: When the Doctor walks into the control room at the base, the time on the computer is frozen between 5:02:57pm and 5:02:58pm. The Doctor grabs River's hand, and time begins moving up to 5:03:00pm before he is restrained. Later, when the Doctor and River kiss and time begins moving again, the time is 5:02:00pm.
Chosen answer: No, no information is avalible for the identity of the entity.
Repo_Man