Basically

Valgallah's Cream's "Chao Force" Super

Command is

D,DF,F X+Y

I'm taking you down like its 1998/1999!

Act Music as Rounds? (may not apply to every stage)

Continue. But classic

(coming some time soon or something.) The 1st Sonic Battle Redux arcade Run: Sonic.

Another returning move For Amy Rose Amy Flash.

2/3 of them are references to

Sonic's Concept and is also a Skin in Sonic Superstars Cream's Debut (Though inconsistent looks)

A former 90s rival's (A red capped plumber guy) recent 3D platformer since 2017

Early previews of "Shining Wine (Not alcohol)" and "Castle Party"

Yoshi and Birdo cosplaying as Ichigo Momomiya

The "Big Green Man" (Guest) teaser.