Fantastic Beasts: 28 Easter Eggs & References You Must See
8. The Grindylow
When Kowalski is walking around Newt's enchanted suitcase discovering all of the Fantastic Beasts in his collection, he comes across a section with creatures living in small self-contained bubbles of water and a larger underwater tank.
Eagle-eyed fans of the series will be able to spot a Grindylow - the creatures that attack Harry when all looks lost during the water trial in the TriWizard Tournament - in one of the bubbles.