Continuity mistake: When time freezes, we see the Hatter's family freeze in the ant farm. When time is mended, he holds the farm close, and his family should have unfrozen at the top of the sand, but they aren't there.
Alice Through the Looking Glass (2016)
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Directed by: James Bobin
Starring: Johnny Depp, Helena Bonham Carter, Anne Hathaway, Mia Wasikowska
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Suggested correction: You might have to look closely, but they are there.
Red Queen: Hello, Alice.
Mad Hatter: Aaahhh!
Question: When Iracebeth takes Mirana back in time to when a young Mirana ate the tarts and lied about it, why would the adult Mirana continue to deny having eaten them?
Answer: The way I interpreted the scene is that Mirana subconsciously altered her own memory to convince herself that she had not eaten the tart to avoid the guilt of the resulting accident. This is a real phenomenon, so it's perfectly plausible. If my assumption is correct, this scene shows Mirana realizing for the first time that she is in fact responsible for everything that has happened since due to a single lie she told.
Answer: I don't think she was actually denying it at that point, just reciting the answer she knew she'd given originally.