A discussion needs to be had about the alternate events Hook and Emma created in the past Enchanted Forest in "Snow Drifts" and "There's No Place Like Home".
Elseswhere, it has been suggested that we use tabs as subsections in the "before first curse" section for those this issue affects. I think this is a good idea.
Please, share your thoughts on this and make any suggestions you may have regarding the issue.
This does not, in my opinion, apply to Emma and Hook themselves, as I see their events as a linear progression. Meaning, the events where they traveled to the past should currently be the last thing in their history sections. This would apply to characters like Snow White, Rumplestiltskin, Charming, Abigail, etc.
Marian might be a bit tricky. I would say the tabs apply to her as well... she dies in one, and is rescued and then pops into Storybrooke in the future in the other XD