Continuity mistake: In the scene where Mulan and Aurora are alone in the forest and Mulan is trying to make a fire, she alternates between wearing her long ponytail over one shoulder, and letting it hang down her back. (00:24:45)
Continuity mistake: After Prince Philip's body is placed on the bier, Mulan wraps the wraith's medallion in a bag and gives it to Aurora. In the wide shot, the strings on the bag are hanging over the left side of Mulan's hand. In the close-up, they are hanging down the right side. (00:33:25)
We Are Both - S2-E2
Continuity mistake: When Regina's father, Henry, tells her about Rumplestiltskin, he refers to him as "someone Cora knew before I met her." However, "The Miller's Daughter" establishes that Cora first met Rumplestiltskin while she was locked up in King Xavier's palace, after meeting Prince Henry when she delivered the flour and at the masquerade ball. (00:10:45)
We Are Both - S2-E2
Continuity mistake: After Mary Margaret is knocked out by Mulan and falls to the ground, the amount of straws and dirt on her clothes changes between shots. When she is thrown into the dungeon with Emma, her clothes are clean. (00:39:55)
Continuity mistake: At the beginning of the episode, when Emma and Mary Margaret are walking through the camp with a group of refugees, in the first shot, they're at the edge of the camp. Cuts to a different shot, and the group have moved to a different part of the camp and are situated next to a table, before they walk over to a shed. In the next shot, they are farther away from the shed. When it cuts, they are standing next to it again. (00:05:00)
Continuity mistake: When Snow is dumped by the road by King George's men, the amount of dirt on her clothes keeps changing between shots. (00:14:15)
Continuity mistake: In the scene where Rumplestiltskin comes home and discovers that Milah is not there, the wool he's carrying keeps changing position in the basket. (00:02:10)
Continuity mistake: At Granny's, when Belle and Ruby chat, the slice of lemon and the straw in Belle's iced tea move around between different camera angles. The same thing happens to the straw in the half empty glass in front of her. (00:12:15)
Continuity mistake: Before the duel, as Rumplestiltskin says, "Sorry, but killing a man with his own sword was just too delicious to pass up", Killian's right arm is bent. In the next shot, his arm is down by his side. (00:17:25)
Continuity mistake: When David and Rumplestiltskin are looking for Belle, when Rumple says "Look, can I ask you a question?", in the background, a man and a woman are crossing the street. In the next shot, they cross the street again. (00:20:40)
Continuity mistake: When Rumpelstiltskin and David are out looking for Belle, they cross the street, and for the rest of the scene, the pedestrians change from shot to shot. (00:20:55)
Continuity mistake: When David and Rumplestiltskin walk down the streets of Storybrooke while searching for Belle, as David says "There is a difference between literal truth and honesty of the heart", a car is seen driving through the street. In the next shot, it's gone. (00:21:20)
Continuity mistake: When Milah and Killian board The Jolly Roger, as Milah says "Fetch some water", a pirate with a coil of rope around his arm has just ascended the deck and is seen near the steps. In the next shot, he is nowhere near that area (he can briefly be glimpsed as he disappears behind a mast in the lower left hand corner). (00:25:45)
Continuity mistake: Aboard The Jolly Roger, Rumplestiltskin says "Do I forgive you? Can I move on?", while walking past Milah. In the first shot, he is right behind her, but in the following wide-shot, he has suddenly moved to a position several meters away from her. (00:26:40)
Continuity mistake: When Rumplestiltskin rips out Milah's heart, Killian catches her as she falls down. In the first shot, the back of her head is resting on his shoulder. In the next shot, her position has changed, and her head is resting on his arm. (00:28:10)
The Doctor - S2-E5
Continuity mistake: When the women find Hook under a pile of dead refugees, the amount and position of the dirt on his face changes a couple of times. The scarf around his neck also changes position. (00:01:40)
The Doctor - S2-E5
Continuity mistake: When Emma is questioning Hook while the group is gathered around the bench, the folds in the cloth/bundle lying on the bench keep changing between shots. (00:14:30)
The Doctor - S2-E5
Continuity mistake: When Hook is tied to the tree, the arrangement of the ropes changes throughout the scene. (00:24:40)
The Doctor - S2-E5
Continuity mistake: When Hook is tied to the tree, Emma raises her right hand to her mouth to whistle for the ogres. In the next shot, she uses her left hand. (00:26:45)
The Doctor - S2-E5
Continuity mistake: When Regina is in the stable with Daniel, after she says "No, I won't lose you again", in some shot, she has her hands on his face/neck. In others, her hands are on his shoulders. (00:31:45)
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.