Continuity mistake: When Alice and Mr. Gold are performing the magic ritual in the cave, the name on the Dark One's Dagger is misspelled "RumpELstiltskin". In every other episode where the dagger appears, it is spelled "RumpLEstiltskin." (00:30:25)
Revealing mistake: When Detective Rogers is chasing Naveen, in several wide shots, the person running isn't Colin O'Donoghue, but his stunt double. (00:25:50)
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.