Foreshadowing is one of Toriko's three scars reacting to Blue Oni leaving his body. (287)
Hinting is Komatsu seeing three demons at a table in Soul World. (349)
Guinness straight up tells Toriko about the monsters (three pairs of legs) hidden in him. Sure, we don't have much information about the third one, but we do know there are more than the two in Toriko.