The Thing You Love Most - S1-E2
Character mistake: Regina says to Emma that her apples are from the Honeycrisp tree, but Regina's apples are not Honeycrisp apples, which have a different color and shape. (00:03:10)
Continuity mistake: When Regina is standing in front of Rumpelstiltskin's mirror at the end of the episode, as he asks, "What are you gonna do now, then?", the cloth that was used to cover the mirror is lying on the floor. When he transforms her back to her normal form, it is gone. (00:38:45)
Revealing mistake: When Sheriff Graham pulls in front of Emma in a police car, the big sign on the storefront behind Emma says "Storybrooke Coffee Co." However, as Graham gets out of the car, you can see a circular sign on the side of the building, which says "Steveston Coffee Co"; Steveston is the Canadian town which doubles as the backdrop for the town of Storybrooke on Once Upon a Time. (00:05:30)
Deliberate mistake: Elsa's dress in Season Four is different from the dress she was wearing in the Season Three finale. The new dress is a different shade of blue, and has a completely different design, even though the present day events of Season Four take place mere moments after the end of Season Three.
The Thing You Love Most - S1-E2
Revealing mistake: When Emma is reading the Storybrooke Daily Mirror in Granny's Diner, the article on the front page is just the same block of text repeated three times. (00:12:10)
Revealing mistake: In real life, the Storybrooke Cannery is known as the Gulf of Georgia Cannery, a real cannery in Steveston village, the town which doubles as the town of Storybrooke on Once Upon a Time. In most episodes where the cannery appears, the name on the building is replaced with the Once Upon a Time version. However, in this episode, when Emma is driving in her father's truck following shortly behind Cruella's car, there is a wide shot of Cruella's car turning right, and you can see the sign on the cannery, which has not been updated properly: Bizarrely, the first word of the real business name is still on the building, and the first three letters of the fictional name are missing, making the name on the building "Gulfrybrooke Cannery." (00:23:20)
Revealing mistake: When Regina is waiting outside the Storybrooke Library, there is a wide shot of Cruella's car making its way down the road. On the building on the right side, you can see a large vertical sign on the side of the building, which lists several local businesses. If you read the top of the sign, you can see that it says "Steveston Hotel." Steveston is the Canadian town which doubles as the town of Storybrooke on Once Upon a Time. (00:20:45)
Revealing mistake: When Emma opens the door of Any Given Sundae in the 2011 flashback, you can see the backdrop curtain used to insert the Storybrooke main street, thanks to its shadow in the middle of the road and a few folds reflecting the light.
Continuity mistake: The flashback scene where The Snow Queen takes Emma's video camera away from Kevin differs from what is seen on the video recording of that moment in "Breaking Glass" and "Family Business." For example, in the recording, Ingrid says, "We respect property in this house, Emma." In the actual scene, she says, "We respect property in this household, don't we, Kevin?"
The Heart is a Lonely Hunter - S1-E7
Revealing mistake: When Emma and Graham are chasing after the wolf into the graveyard, there is a shot where the wolf turns its head toward them, closes its mouth and perks up its ears, while growling. The wolf howls, before turning its head toward them again, and you can see that it is exactly the same shot that was used earlier, only this time, the wolf can be heard whimpering. (00:28:40)
The Thing You Love Most - S1-E2
Revealing mistake: When Emma walks Henry to school, as Emma says "Because I'm the daughter of Snow White and Prince Charming?", a reflection of the clock tower building is visible in the window behind her, only there's no clock (the top two layers of the clock tower, including the clock, are visual effects). (00:13:40)
The Miller's Daughter - S2-E16
Visible crew/equipment: When Rumpelstiltskin goes to Cora as she is trying on her wedding dress, as he sits down on the chair behind her, you can see the tape used to mark the spot on the floor - it's bright red and in an X shape. (00:24:39)
An Apple Red as Blood - S1-E21
Visible crew/equipment: After Regina walks into Gold's shop and tells him about the sleeping curse, just as she asks, "Don't you understand?" we can see the green tape mark (and its reflection) on the floor in front of the display case, where Regina is about to stand. (00:38:55)
What Happened to Frederick - S1-E13
Deliberate mistake: When August takes Emma to the Wishing Well, the well is not in the same location as later in the series. When Emma and August are at the well, it is situated next to the road (August takes her there on his motorcycle), with a giant tree in the background. In in 1-22 "A Land Without Magic", and every other episode where the well appears, in is situated in a clearing in the middle of the forest. (00:22:35)
Tougher Than the Rest - S6-E12
Visible crew/equipment: When Sir Henry searches for his mother and The Evil Queen along the water's edge, in the shot where he says, "They crossed the river", as he turns his horse around, a horse wrangler's hand can be seen holding the horse's bridle in the lower half of the screen, guiding the horse to turn around. (00:04:20)
Revealing mistake: When Graham offers Emma the job as deputy sheriff, as he says, "Why don't you think about it", in the background, the name "Steveston" appears on the sign on a business next to Kisamos Greek Taverna. Steveston is the name of the Canadian town which doubles as the town of Storybrooke for exterior scenes. (00:05:50)
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: The exterior shots of the buildings located across the street from Granny's Diner do not match the view seen through the front door, from inside the diner. The most obvious example is the building next to Storybrooke Country Bread, on the opposite side of the street. In the exterior shots, on the left side of the bakery, there is a blue wooden building (this can be seen, for example, when Emma is walking Henry to school in "The Thing You Love Most"), with a huge gap of approximately ten meters between the two buildings. In the interior shots where the front door of Granny's Diner is open, the view is drastically different looking: For example, when Regina enters the diner to confront Mary Margaret in "The Shepherd", when Emma brings Henry to the diner in "Welcome to Storybrooke", when Zelena enters the diner in "It's Not Easy Being Green" and when Emma comes into Granny's Diner to ask Hook out in "The Apprentice", the characters open the front door, and now there is a completely different building next to Storybrooke Country Bread. The new building seen through the doorway is made of bricks and has a completely different color, and there is no longer any gap between the two buildings; they are touching each other. Also, in some episodes, like "The Shepherd" and "7:15 AM", in the scenes inside the diner, you can see a grey wall on top of Storybrooke Country Bread. In exterior shots, there is no such wall.
Revealing mistake: When Emma leaves the apartment to go looking for Ashley, she and Henry walk down the streets of Storybrooke, toward Emma's car. As Emma says, "Because I know", in the background, you can see a business called Steveston WineMakers. Steveston is the name of the Canadian town which doubles as the town of Storybrooke on Once Upon a Time. (00:14:35)
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.