My Little Pony LIV:E Long and Pony!

[Anarion]

season 3 inconsistency

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Crystal Ponies gone for 1000 years... speech pattern normal.

Luna gone 1000 years... Royal Canterlot speech pattern?

also... pony appears to like to disappear for 1000 years at a time.

Simple Resolution: Particular to Canterlot Royals

Now the villain should totally do that though...

Although Soras is probably right, an alternative is that it's just Luna and she's both awkward like that and the recipient of one of Celestia's 1,000 year long troll attempts. Heck, for all we know, Celestia's joke about adopting the Royal Canterlot Voice was the straw that broke the camel's back and pushed Luna into Nightmare Moon mode in the first place.