According to pictures, Sans (or more commenly known as Stanz in RP) has two streaks on each of his eyes and two cracks on his right eye.
Papyrus is 12 in this AU.
Frisk has a flower in her hair and can use a red lance, which is assumed to be DETERMINATION.
Undyne has a red and black eye.
ST!Papyrus shares the same birthday as the creator, though it is unknown.
Uploaded on 21 June 2017
In a Roleplay, Tiyuji has stated that the trailer is inaccurate.