Continuity mistake: At the beginning, when the Doctor takes Amy to planet One, he holds out his hand for Amy to take hold of when they're about to leave the TARDIS. When you see her from the back, Amy lifts her hand wearing her red fingerless gloves. But when it switches shot and faces Amy from the front, she takes the Doctor's hand wearing no gloves. When she steps out of the TARDIS, her gloves are on again. (00:04:54)
Continuity mistake: When the Doctor, River and Amy are exploring, several shots of him are obviously reversed because of the flipped hair part and the fact that he's using the sonic screwdriver in his left hand in them. (00:09:00)
Continuity mistake: When the Doctor and River open the door to the room with the Pandorica and walk inside, River's right arm, with which she's holding a torch, changes position between shots, as does how she's holding the torch. (00:11:04)
Other mistake: As Amy, River and The Doctor enter "the Underhenge" River says "More than just a fairytale." This is a reference to The Doctor saying pretty much the same thing to River at the end of S5 E5 when she says she will see him again "when The Pandorica Opens." This moment has not happened for River yet, it is still in her future. So how can she "call back" to it? (00:11:48)
Continuity mistake: When River is talking to the Roman commander after disintegrating a piece of furniture with her pistol, she is shown raising her fingers from the pistol's grip in a shot facing the commander. However, in all following shots facing her, her fingers are still lowered. (00:17:50)
Revealing mistake: When the Cyberman arm is shooting at the Doctor and Amy, just after the Doctor jumps out to draw its fire, Amy leans on the Pandorica and you can see it bend in, revealing that it's made out of plastic or something. (00:20:42)
Revealing mistake: As Amy stands where she is told, a cable comes towards her feet. As it does, a black thread can be seen pulling it up to wrap around her leg. (00:21:39)
Continuity mistake: The Doctor's hairstyle alternates from parted over the left side to a right side part and back while standing by the Pandorica. (00:27:40)
Continuity mistake: When River is looking at Amy's book about Pandora's Box, her grip on it changes between shots. (00:35:56)
Visible crew/equipment: When the Cyber-arm is shooting at the Doctor and Amy, there is a brief shot when the Doctor is talking where you can see the crew member who is shooting at them.
Continuity mistake: The Doctor's hair changes from the time he realises Rory is there to when the Pandorica is unlocking.
Chosen answer: No, no information is avalible for the identity of the entity.
Repo_Man