"My name is Gregory Goyle and I smell." Written next to the entry on trolls for bonus points.
The book's intro talks about how wizardkind sought to differentiate between "beings" and "beasts", with the first classification of a "being" being anything that walks on two legs. This subsequently leads to chaos at a meeting of all these "beings": trolls smash the place up, hags look for children to eat, and Augureys make a huge din. Ultimately, the wizard in charge of opening the meeting runs cursing from the hall after slipping on some Porlock dung.
This conversation scrawled on the first page:
Harry: This book belongs to Harry Potter.
Ron: Shared by Ron Weasley because his fell apart.
Hermione: Why don't you buy a new one then?
Ron: Write on your own book, Hermione.
Hermione: You bought all those Dungbombs on Saturday, you could have bought a new book instead.
Ron: Dungbombs rule.
And of course Janus Thickey's "last words", a scribbled note saying:
"Oh no, a Lethifold's got me, I'm suffocating"
And later it turned out that he was actually having an affair with a local barmaid. Naturally, his wife was not pleased.
The ending of the official teaser has Newt descend into his suitcase while Jacob watches with wide eyes, sandwich halfway to his mouth. Then Newt whistles, his hand beckoning from the suitcase, and Jacob can only point at himself in bewilderment.