Aside from End Sequence, there are two cutscenes at the end of the game. Whether or not you get to see them depends on the state of completion of your file, but is not related to the visible percent counter in any way. On top of that, both cutscenes have different triggers, meaning that the second one requires a slightly higher completion that the first. The exact way the cutscenes is to get 201 Bananas, 20 fairy photos, 10 Crowns and all of the medals, This was noted in Issue 141 of Nintendo Power.