Snow Falls - S1-E3
Visible crew/equipment: When the horse carriage is ambushed, just as Princess Abigail can be heard screaming "Please, help me", the camera pans downward and a horse wrangler wearing a blue baseball cap can be seen in the lower left hand corner, hiding behind one of the horses. (00:03:20)
Snow Falls - S1-E3
Revealing mistake: When Snow White steals one of the royal guards' horses, as she rides off, in the second shot, you can see that the one riding is not Ginnifer Goodwin, but her stunt double. When Prince Charming catches up to her and knocks her off her horse, Josh Dallas' and Ginnifer Goodwin's stunt doubles can both be seen. (00:03:55)
Snow Falls - S1-E3
Continuity mistake: As the trolls search through Prince Charming's belongings, one of them is seen pulling out Snow White's wanted poster from the bag, but in the previous overhead shots, he was already holding it in his hands. (00:27:45)
Answer: He knows who she is because he knows that the fairy tales are true. He was also shown to sneak out to go see Emma or someone else. Sometimes he succeeded, sometimes he didn't. This is how he knew to look for her despite his strict mother.