#2 The Fireflies returned!
Now, this may be the most obvious one yet, but it is just another nod - like the lantern - to Bray Wyatt's character. I don't think anyone even contemplated the return of the Fireflies during the entrance as everyone was just so excited to see what happened - but they were out in full force last night.
The Fireflies made Wyatt's entrance one of the most special in WWE history, and it looks like they'll do the same for The Fiend. Granted, it's almost a must due to how dark the arena gets for The Fiend's entrance, like Wyatt's - but it's something that doesn't even happen for The Undertaker despite the Deadman making his way to the ring in near pitch-black conditions.
Let's hope The Fiend is kept special and we don't see too many of these entrances, but it did make for incredible viewing experience, and something that definitely adds to The Fiend character.
If nothing else, this, the lantern and one more thing all add to creating a certain bit of nostalgia around The Fiend, linking him up to the previous Bray Wyatt character to complete the perfect repackaging, and that final thing is...