Already brought it up in the promo topic, but throw it into the discussion here too. What if Wendy’s London is not our historical London but the London of another storybook world, the world of the Darlings, Oliver Twist, Mary Poppins? Of course that nevertheless raises the question of time, but not of time travel, “only” of time being different in different (storybook) worlds. We already have the headache, how the stories came into our world and became our known fairy tales if they happened not hundred of years ago but only a few decades ago, so just a tiny bit adding to support these headaches.
It’s just that I remember to have heard K&H said in some interview, that there was no time travel. Unfortunately don’t remember exactly in which interview they said it, it was in connection with talking about the Jefferson’s hat (if I find it again, will let you know).
¯\_(?????? ?)_/¯