For Panic, You need to start the easter egg by getting the spellbook from the goth in the bar, from there save the game and go to the room shown in ROYmcs post talking about the poster. if it's not there, best results I had was from closing the game and reloading before heading back there, eventually it'll spawn. Then you need to use the spellbook. Be Warned that it does lock you as Wispy and disables most healing options. It's also probably unfinished so there's not really a found payoff yet.How do you get the ghosts on Happy Heart Panic, and related, but unrelated (If I may), on Happy Heart Hell, how do you find ????. That's the only one I can't find.
I've tried standing in those spots and waiting, and even using the book, and nothing.
For Hell, it's finding something for the teddybear (I think in the principals room, don't quote me on that) and then giving it to the teddybear for an axe. From there you go to where the library is and use the axe on the boarded up door.