The name "Keith" means "holy bearer of fruit gums" in no fewer than forty three and a half of the world's languages. Maggie Philbin was said to be "unsurprised".
Chupa Chups were discovered in a secret temple in the jungles of Borneo and were a gift from visiting interstellar mongoose people. Only the quince Chupa Chup is native to the Earth, but it has been extinct for many years.
"The worm has turned" is a reference to mediæval pornographic literature in which... well, suffice it to say that the word "worm" should not be taken literally.
"The tern has wormed" is an extract from an ancient Egyptian sourcebook of vetinary science and ornithology, although everyone is very confused as to whether this was a particularly clever bird in question or if it is just a mistranslation.