If you get sucked into a portal at the exact same time as you pick up the last

, does the 50K bonus still happen? When I tried it, the answer seemed to be "no," but I can't be positive that the last shard didn't simply expire right at that instant.
I found out, on my last Nightmare Mode game, that it IS possible to survive the exit from PD72! (A good thing, too, since I needed every last life for Tuber.) Still not sure how, though. Igor was overlapped by a whole lot of oranges from both sides, it seemed... Also, considering that the enemies can start in two or three random configurations whenever you enter a level, I'm not optimistic that there's a sure way to survive every time.
This might be common knowledge, but here's a handy strategy for screens where you have to bring the fruit down through multiple platforms with blue bombs: There's a way to depose an enemy two levels above you without having to jump up a level. Position yourself under a vertical wall adjacent to the enemy's platform, and jump into it while kicking up. The bomb will knock the enemy down to the level above you, while you will land back on your original platform (instead of one level up from where you started, next to the stunned fruit). You can immediately knock it down to your level with a normal up-kick, and down again with a plain old kick. That can save a lot of looping around from top to bottom, e.g. on levels like 95 and 54.2.
It can also be useful with regular bombs. Say for example that you need to freeze an enemy that's four squares above you instead of the standard three. A single up-kick isn't high enough to get the bomb onto the platform, while a double up-kick would bring you up TOO high, potentially resulting in a fruit-to-the-face. If there's a wall on either side of the enemy's platform that you can jump into (guaranteeing that the fruit won't touch you, since they conveniently stop at walls), you can freeze it safely with a double up-kick.