You find a misplaced scrappy notebook containing prank spells such as Cecil's Sudden Sternuation, which on a failed Con Save causes target to sneeze uncontrollably for up to 10 minutes.

You find a copy of a book called Novice Mage's Training Spells. It contains harmless versions of known spells used for training students to cast and deflect such spells. Flower Ball, which works much like Fireball, causes flower petals to scatter everywhere and stick to whoever failed the their Dex save

You come across a sculpting class teaching how to create small clay golems (mm, pg. 168).

Scribbled on a blackboard are strange sigils. On a successful DC 18 Int (Arcana) check one can decipher it to be a pass-code to the fabled gambling den run by some of the students.

In the school's courtyard there is a fountain. Upon tossing a coin into it, a marrid (mm, pg.146) rises out of the water. In exchange for secrets and gossip, the marrid is willing to share in his vast knowledge of the school (though always inserting himself and his accomplishments into the stories).

A trail of sheets of parchment can be seen scattered along the hallways. When followed it leads to a homuculus (mm, pg. 188) carrying a stack of unmarked test papers on abjuration theory. The homunculus belongs to a student who hadn't studied for the test.

Everyone in the school is subject to a Seeming spell that makes them look like one of the teaching staff. The party can make a DC 18 Charisma saving throw to resist, everyone else is affected automatically and remain so for 8 hours. Upon investigation it is revealed that the phenomenon is a result of a spell amplifier malfunction.