Evil Mario runs by as Mario is chasing him. At no point due the locals realize the obvious nor at any point is an apology given to Mario.
Mario gets blamed and falsely accused for his evil twin ruining the island. However, the locals overlook some obvious things. One: Mario JUST arrived with Princess Peach, who could vouch that he hadn't been there without her prior. Two. The evil copy is all dark blue only color, skin included. Mario has human skin and has red clothes along with his blue overalls.
The "evil" Mario is to be harmed if hit with water from Mario. However, sometimes when you chase him he might jump into water without harm.