Fantastic Beasts: 28 Easter Eggs & References You Must See

The creatures that escape from Newt's suitcase include a little blue creature. This is a Billywig, the winged insect that is native to Australia. We've heard of them before.

In another link to the Lovegood family, it is revealed in The Deathly Hallows that Xenophilius Lovegood created his own version of Rowena Ravenclaw's diadem using dirigible plums, Wrackspurt ciphons and Billywig wings.