The 1953 Disney Peter Pan has one plot point that seems a real improvement over Barrie's versions:

In Barrie's published versions, (a) nothing comes of Peter banishing Tinkerbell, and (b) Hook's discovery of the House Under the Ground is unmotivated coincidence.

Disney fixes this, by having Hook seduce the forlorn Tink, getting her to betray the location.  Tink's near-death when she rescues Peter is also her redemption from her betrayal.  From a storytelling perspective, this change is just about perfect, tying together loose ends and turning unconnected events ("this happens and then that happens") into a plot ("this happens and caused that to happen").  The 2003 movie also uses this technique (though they return to Barrie's device of Hook poisoning Peter's medicine).

But was this really Disney's invention, or is there something in Barrie's revisions which precedes this?