Continuity mistake: When Bossy is cutting Dreamy's beard, Dreamy asks "Who was the woman I saw?" and Bossy stops cutting, but a couple of shots later, Dreamy's beard is suddenly much shorter. (00:10:00)
Continuity mistake: There's a flashback to the life of young Pinocchio, played by brown-eyed Jakob Davies. But adult Pinocchio, Eion Bailey, has striking bright-blue eyes. It's possible that a blue-eyed child may grow up to have brown eyes, but the opposite does not happen.
The Thing You Love Most - S1-E2
Continuity mistake: In the beginning of the episode, as Regina stops below the clock tower and gazes at the clock, there is no sign on the blue building in the background, next to Storybrooke Country Bread. When she notices Emma's car, there is a sign on the building. (02:55:00)
Continuity mistake: When Emma arrives in town, two Storybrooke businesses, Standard Clocks and its neighbour, Modern Fashions, can be seen in a shot though a window. In the shot from above where Emma's car slows down, the name on Standard Clocks is Kaido (a real-life business in Steveston, the Canadian town which doubles as the town of Storybrooke), and there is now a white sign on Modern Fashions, which wasn't there in the first shot. (00:15:45)
Continuity mistake: At the end of the episode, the hands on the clock tower move forward for the first time. In the wide shots, the circle surrounding the clock, as well as the wooden beams forming the outer edges of the area around the clock face, are white. In the close-up where the minute hand moves, the circle and edges are brown. Also, in the wide shots, the area around the clock face of the building is shaped like a square, but in the close-up, it is in the shape of a trapezoid. The same thing happens when the clock moves in "The Thing You Love Most", "A Land Without Magic" and "Darkness on the Edge of Town." (00:41:25)
The Heart is a Lonely Hunter - S1-E7
Continuity mistake: When Graham is arguing with Emma at the beginning of the episode, in the very first shot outside Granny's, they are approaching a shop called Worthington's Haberdashery. As the shot ends, they are still a few meters away from it, but in the next shot, they are already in front of it. (00:01:50)
Continuity mistake: Emma Swan has a flower tattoo on her left wrist. It can be glimpsed during her date with Ryan, and is visible when she's sitting at the table with Mary Margaret in "The Thing You Love Most", and when she's on the phone with Ruby in "Red-Handed." However, when she opens the door for Henry in "Pilot", the tattoo is gone. The same thing happens when she unlocks the door to her room at the inn in "The Thing You Love Most" (in the scene where she is evicted), and when she's pressing a pack of ice against her wound in "The Heart is a Lonely Hunter."
Continuity mistake: When Emma finds Snow White's glass coffin, there's a hole in the lid. In the overhead shot, the hole is rather small, but in the shot from inside the coffin, the size of the hole has changed dramatically. In the next shot, it is small again. (00:20:15)
An Apple Red as Blood - S1-E21
Continuity mistake: In Regina's dream, when she walks away from the dinner table to answer the doorbell, she is wearing black pants. When she is tied to the tree, her pants are grey. (00:01:05)
Continuity mistake: When Emma and August are walking down the street in the morning, as he says "Take the day off. Come with me, and I'll show you", behind them, a man and a woman can be seen crossing the street. In the next shot, the exact same couple crosses the street again. (00:01:50)
Continuity mistake: When Pinocchio takes baby Emma in his arms, in the first shot, her baby blanket is wrapped tight around her. In the next shot, it is wrapped in a completely different way, less tight, with huge folds and the purple bands are tied up differently. In the next shot, the blanket is tightly wrapped around her again. In addition, when Pinocchio finds Emma inside the tree trunk, the way the blanket is wrapped around the baby is different from the way it was when Charming sent her through the magical wardrobe in "Pilot." (00:29:50)
The Return - S1-E19
Continuity mistake: When Mr. Gold is talking to Dr. Hopper in his office, there's a box of tissues on the table. The amount of tissue paper sticking up from the box keeps changing between camera angles. (00:26:15)
Continuity mistake: The dove that Mary Margaret finds in the woods has white feathers with a reddish plume around its neck. When she releases the bird after the storm has passed, it is not the same dove. The dove that she releases is completely powder white, with a different colored beak. (00:12:20 - 00:29:40)
Continuity mistake: When Emma hears the scream and asks Ruby what's going on, her hands are bare, but as she runs off to investigate, she's suddenly wearing red gloves. In the next shot, her hands are bare again. (00:40:30)
Continuity mistake: When Regina is on the stretcher, she has a yellow coat around her shoulders. As she pushes Sidney away, the coat has vanished into thin air. (00:23:50)
Continuity mistake: The feathers in the enchanted quill that Cinderella gives Rumplestiltskin keep going from being smooth and even to being frayed between shots. (00:28:55)
Continuity mistake: Regina and Daniel are in the stable. Regina's hands are on his face, he reaches up and pulls them down, cut to behind Daniel and her hands are back up on the side of his head. Cut back to side view, and Daniel's hands are still holding Regina's down. (00:16:40)
Continuity mistake: Belle is talking to Rumplestiltskin and sitting on his dining room table. The red rose in the vase he gave her keeps moving. It is leaning to the right, to straight up, then to leaning to the right again. Neither of them touch it, so it should not be shifting around.
The Heart is a Lonely Hunter - S1-E7
Continuity mistake: In beginning of the scene where Regina pays a visit to the Sheriff Department, the darts on and around the dartboard change position between the close-up of the dartboard, and the wide shot where Emma bends down to pick up a dart. (00:22:05)
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.