The Heart of the Truest Believer - S3-E1
Continuity mistake: When Neal and Mulan are walking to Rumpestiltskin's castle, after Mulan says "Your belief in love wasn't strong enough to overcome your fear of rejection", her hair keeps changing. In close-ups, some of her hair is over her shoulders; in the wideshots, all of her hair is behind her shoulders. (00:23:00)
Continuity mistake: When Emma and Hook kiss, in the shots from behind Hook, Emma tilts her head to the right. In the shot from behind Emma, she tilts her head to the left. In addition, Emma's left hand jumps from the back of his head to his shoulder between shots. (00:37:10)
Continuity mistake: When Killian rallies his crew to join him in taking over the ship and becoming pirates, as he's holding onto the ropes used to control the vessel's sails, the number of ropes he's grasping repeatedly changes between shots; in some shots, it's only two ropes, in other shots, there are three ropes in his hand. (00:38:50)
Continuity mistake: In Neverland, the piece of cake that Rumplestiltskin wishes for changes during this scene, with regard to the amount of chocolate, white cream, etc, and also its position on the wood after Rumple puts it down. (00:16:45)
Continuity mistake: In Neverland, when Rumplestiltskin's father tells him to think of a food, a slice of cake appears in the palm of the boy's hand. When Rumple walks to place the cake down, suddenly there's a round, white doily under the slice, but when he sets the cake on the wood the doily is gone again. (00:16:50)
Save Henry - S3-E9
Continuity mistake: When Regina talks to Rumplestiltskin, he is holding onto the bars in his cell. In the beginning of the scene, his left hand keeps clutching different bars between shots. After Regina says "Nothing can stop me now", his hands keep going from holding the bars and not holding them. (00:02:00)
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)
Going Home - S3-E11
Continuity mistake: In the Neverland flashback, when Hook offers Tinker Bell the rum bottle, the stopper (attached to the bottle) is hanging over the back of his hand. In the next shot, it is not. (00:09:55)
Going Home - S3-E11
Continuity mistake: When Peter Pan removes the enchanted black leather cuff from his arm, he uses his magic to transfer it to Mr. Gold's wrist. However, as he sends Mr. Gold flying across the room, there is a close-up of Pan's arm, where the cuff is back on his arm, next to the normal brown cuff that he usually wears. (00:21:20)
Quiet Minds - S3-E15
Continuity mistake: When the Vault of the Dark One opens, there is a wide shot where Neal turns around, and you can see that the area around the circular vault is covered in snow. In the next shot, a large area around the vault is free from snow. The amount of snow around the vault keeps changing during the rest of the scene. (00:26:45)
It's Not Easy Being Green - S3-E16
Continuity mistake: When Hook is at the beach with Henry, after he says to him, "Fair enough, mate", the pendant on Hook's necklace goes from resting against his chest, to being partially tucked under his waistcoat. In the close-ups, the pendant is completely covered by the waistcoat. (00:26:50)
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)
Continuity mistake: After Emma gives Hook mouth-to mouth, her left hand keeps changing position: Most noticeably, as she whispers, "Hook, come back to me", her hand is on his chin. In the next shot, her hand is resting on his chest. (00:11:50)
Continuity mistake: When Zelena loses the Dark One's Dagger, it lands on the ground, the patterned side of the blade facing upwards. When Regina picks up the dagger, the patterned side is facing downwards. (00:28:10 - 00:29:20)
Snow Drifts - S3-E21
Continuity mistake: While Henry and his family are gathered around the table at Granny's, the amount of juice in the glass sitting on the table keeps rising and falling. (00:06:50)
Snow Drifts - S3-E21
Continuity mistake: When Emma changes clothes in the Enchanted Forest, as she puts on gloves, in the wide shot, she begins to put the glove on her left hand. In the following close-up, her left hand is bare, and she's putting the glove on her right hand. (00:18:15)
Snow Drifts - S3-E21
Continuity mistake: At the docks, when past Hook lifts Emma up, as he says, "Oh, no need", Emma is on her feet, facing him as he begins to pick her up. In the next shot, Emma is facing a different direction, her back leaning against his shoulder/arm as he picks her up and starts carrying her. (00:32:10)
Snow Drifts - S3-E21
Continuity mistake: When Emma is making out with past Hook while future Hook skulks around the room attempting to stay hidden, in the second shot, Emma's back is facing the stairs/ladder, her hand gripping Hook's coat. In the next shot, her back is facing the table, and her hand is on Hook's shoulder. (00:33:20)
Snow Drifts - S3-E21
Continuity mistake: Aboard The Jolly Roger, when Emma is keeping past Hook occupied while future Hook skulks around the room, in a wide shot, future Hook sneaks past a corner. In the next shot, he begins to sneak past the very same corner again.
There's No Place Like Home - S3-E22
Continuity mistake: When Prince Charming shows Snow White the wanted poster, the poster does not have Snow White's name on it. Two shots later, he's still holding it up, but now the poster has her name printed on it. (00:05:30)
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.