Out of Flight: I thought I'd make a list (as everyone else is doing) what Goten does and doesn't remember.
He remembers his father came to Citta.
He remembers his relationship with Tony, Harley, and all those he's met as well as all events that has occured here.
He doesn't remember what he explained to the others in Citta about his family and friends.
He will remember absolute nothing about events or people, except for colours but will not remember the event/people itself.. (i.e; He remembers the pink, but not of Buu. He remembers the purple, but not of Trunks. He remembers gold but not of Super Saiyan, etc)
Slowly, he will regain fragments of memories upon seeing certain objects, being retold certain events - but above all, Goten will remember his past most clearly during battles, fights, and spars.