When it came to the Banner/Hulk psychology/morphology Kenny was totally faithful to the comic. In both the Hulk's comic and TV series introducing additional stimuli such as new danger or pain to a calming Hulk-in can reverse it, but as seen in 747 there's little David (or anyone) can do to actually reverse a Hulk-out once it fully begins... unless you're talking about instances in comics where Banner gains complete mental control over the transformations, which he never had throughout the TV series.