I thought I might post this as well since this hasn’t been posted yet- http://www.ign.com/articles/2013/04/05/paul-reubens-pee-wee-herman-joins-the-cast-of-the-alice-in-wonderland-once-upon-a-time-spinoff-as-the-white-rabbit
Basically, what this says is that Pee-Wee is gonna play the White Rabbit in the spin-off.
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Keeper of Tamara's death, Cyrus's bottle, Ariel's red hair, and the mermaid that got turned into a statue in the season 3 premiere episode.