The name "Newt Scamander" appears on the Marauder's Map in Harry Potter e il prigioniero di Azkaban (2004).
Within the Harry Potter universe, Newt Scamander's "Fantastic Beasts and Where to Find Them" was first published in 1927, and became a massive bestseller, as well as an approved textbook at Hogwarts. By the mid-1990s, when the Harry Potter series is set, it was in its 52nd edition. Scamander also has the distinct honor of having his own Chocolate Frog Card.
The gray and yellow scarf that Newt has in his suitcase and wears in the film's last scene, as well as in promotional materials, is an allusion to the fact that he was in Hufflepuff while attending Hogwarts (a fact that J.K. Rowling has confirmed in supplemental materials).
A scene was filmed with a shirtless Newt Scamander, which showed off all the scars he had collected on his body during his work with dangerous animals. Eddie Redmayne had worked out considerably before filming, just for that one scene. However, unfortunately for him, the scene was deleted from the final print.
Prior to filming, Eddie Redmayne was provided with a very detailed backstory, which J.K. Rowling revealed exclusively to him.