Longest officially recognized place name is Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu.
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In Turkish, the bird we call a Turkey is called "Hindi" ("from India"). In India, it's called "Peru." In Arabic, the bird is called "Greek chicken"; in Greek it's called "French chicken"; and in French it's called "Indian chicken." The bird is indigenous to none of these places.
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Floccinaucinihilipilification, the declaration of an item being useless, is the longest non-medical term in the English language.
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"Stewardesses" is the longest word that is typed with only the left hand.
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Shakespeare invented over 1,700 words that we use today.
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Switching letters is called spoonerism. For example, saying "jag of Flapan", instead of "flag of Japan".
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