As I read I come across some things that sound very similar to things Seth described. I present these here.
Selected quotes from I Am That.
A Drug trip where the individual experienced probable selves.
Seth describe's Mihaly Csikszentmihalyi's 'The Flow'
Bruce Moen's description of the entity
NLP's swish technique with Exercise 4 from Seth Speaks
Bhagavan Das experiences food vibrations