Revealing mistake: After Ariel stabs The Evil Queen in the neck with a fork, Ariel and Snow White jump into the ocean to swim away. In the underwater shot, you can see that the ones swimming through the water are not Ginnifer Goodwin and JoAnna Garcia Swisher, but their stunt doubles. (00:29:20)
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)
Continuity mistake: As Pan (in Henry's body) is first looking through Henry's storybook, after he turns the page, the left page is just text. Cuts to a different angle, and the same page has a big picture on it. (00:13:10)
Snow Drifts - S3-E21
Audio problem: As past Hook carries Emma aboard his ship, he drunkenly and loudly declares, "Behold! The Rolly Joger." Although they are several meters away from the camera, you can see that his lips are barely moving. (00:32:15)
Continuity mistake: After Emma pulls Hook out of the tub of water, the wet hair plastered to his forehead keeps changing from shot to shot. (00:11:30)
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."
Revealing mistake: When Killian Jones is dueling Rumplestiltskin and is pushed into some barrels, you can see that the one who actually falls down is not Colin O'Donoghue, but his stunt double. (00:18:20)
Continuity mistake: When Mr. Gold and Belle are walking to the pawnshop together, their position in relation to the storefronts they walk past keeps changing. Most notably, they walk past a couple of wheelbarrows three times in consecutive shots. (00:13:35)
Continuity mistake: When Red meets Quinn, the way her hood is draped over his arm changes throughout the scene. The same thing happens when Red is holding it afterward. After Quinn drops the hood, the way the garment is crumpled up on the ground changes between shots. (00:12:05)
Continuity mistake: When David is confronted by Albert Spencer at the diner, as David gets up, his glass of beer is almost empty. When he picks it up, the glass is half full. (00:05:15)
Continuity mistake: At Granny's, when Ruby is clearing tables and Billy startles her, the amount and position of the food on a plate changes between shots. The cup and the napkins also change position on the table. (00:02:35)
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 Mary Margaret and Emma attack Cora, she vanishes into thin air. In the next shot, they run toward the portal, and their weapons have mysteriously disappeared. They were there in the previous shot, and there was no time to get rid of them, especially not Mary Margaret's quiver, which was strapped to her body. (00:30:50)
Continuity mistake: During the showdown at Lake Nostos, Mulan's long ponytail alternates between hanging down her back to being in front of her shoulder between shots. Emma's hair also keeps changing position. (00:27:30)
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)
Chosen answer: Even if one can see the future, it can be somewhat vague and left open to interpretation.
raywest ★
He can sees the future all jumbled up. It is like a puzzle, it is hard to put together, but even when he does put it together it is not set in stone the future can change.