It is too easy to make or better on top while in Fantasyland, which you can see all 13 cards at once, so the rules for remaining in Fantasyland are a bit stricter.
A player in Fantasyland gets to “stay in Fantasyland” if he makes quads or better on the bottom, a full house or better in the middle, or three-of-a-kind on top. The full list of hands qualifying to stay in Fantasyland are below: