City Of Villains Easter Egg - Jenny Song Reference

Enter the University in Cap Au Diable.

Talk to Dean John Vu, and accept the first invention tutorial mission titled "Read the Hastily Scawled Note"

Click on note on the desk to read it.

At the bottom of the note, it reads:
Jenny (555) 867-5309 Call her!

This is a reference to the rock song that caused the phone company to create an "invalid" exchange 555-xxxx that is used in songs and movies today so people don't get tons of annoying phone calls.