Once Upon a Time in Wonderland / Shout Out

General

Season 1

Down the Rabbit Hole

Alice in Wonderland: Young Alice wears signature white and blue dress.
Aladdin, Aladdin: The Return of Jafar, Aladdin: The Series and Aladdin and the King of Thieves: Jafar uses a carpet to fly around.

Other

Unlike the example above, the carpet is a non-sentient being like in The Thief of Baghdad, Iznogoud, MÄR, The Banana Splits as well as Magic Carpet. Jafar is also a name of another antagonist though with an extra ‘f.’
Cyrus is based on a genie from Arabian Nights if not from the ''Aladdin taile.
Characters Alice, Knave of Hearts, the Red Queen, Cheshire Cat, Tweedledee, Tweedledum and the White Rabbit from Alice's Adventures in Wonderland first appear. The Knave is also based on Will Scarlet.
Not only is it mentioned, but Storybrooke is a setting for one scene and the characters of Grumpy and Cinderella appear, along with Knave of Hearts almost being hit by Emma’s yellow VW Beetle.
Despite not being featured in the episode itself, “Bohemian Rhapsody” used heavily in the promotional ads, with its emphasis on the lyrics "No escape from reality."
Jafar uses the spell "Fiat Lux" to make light in the episode "Nothing to Fear", which Willow used in the Buffy episode "Out of My Mind".

Aladdin, Aladdin: The Return of Jafar, Aladdin: The Series and Aladdin and the King of Thieves: Agrabah appears.
Disney Fairies: Character ‘Silvermist’ shares the same name to a character from the franchise.

Other

When Alice says they are going to find Cyrus' necklace in Mimsy Meadows under the Tum Tum Tree, Knave mocks the place name as somewhere only a Care Bear might go.

Other

The Red Queen says the Sarlacc would digest Alice over a millennium.
The Caterpillar has a personality and a leadership similar to Jabba the Hutt. His mushroom is a retreat for criminals like The Cantina and Jabba's Palace.
Along with the Enchanted Forest being a setting, the quote "all magic comes with a price" is said.
Not to mention Sean Maguire, Jason Burkart and Kristin Bauer van Straten reprise their respective roles of Robin Hood, Little John and Maleficent.
Episode title refers to a genus of flowering plants the ‘myosotis flower’ commonly known as “Forget-me-nots.” It’s also a title of four different movies^note, title of an episode of four series^note, titled of a song by seven different musicians^note and a manga series by Kenji Tsuruta
Grendel based on a character of the same name from the Anglo-Saxon Beowulf epic poem debuts in this episode.

Disney’s Aladdin in Nasira’s Revenge: Jafar’s mentor and lover Amara bears a resemblance and same clothing to Nasira, who also first met Jafar when he was a child.

Other

Alice disguising herself as the headsman in order to save Knave from being publicly executed is reminiscent to how D'Artagnan escaped from beheading, though the latter knew who the executioner was.
First making her appearance, Elizabeth, nicknamed “Lizard” is based on ‘Bill the Lizard.

Other

Debut episode, the King is based on the Red King in the sequel to Alice's Adventures in Wonderland.
The punishment imposed on the old prisoner in Jafar's tower is to push a boulder aimlessly, much like the Greek mythos of Sisyphus.

Other

A character based on Through the Looking-Glass known as ‘The Carpenter’ makes his appearance.
The flowers that make you forget your mission and stay behind, eventually causing death, might be a reference to the Lotus Eaters of The Odyssey.
Just before we have the Dark Forest and the "Abandon all hope" from The Divine Comedy. In hell, suicides turn into sentient trees.