- Tanks stay on the screen too long, the movement script basically had them follow the player and repeat it indefinitely.
- Bombers dip down too low... so even if you skillfully dodge a barrage of bullets (which you will have to on the higher settings), you could still crash into them fairly easy.
Fun With Old Code (TM) basically.

I'm definitely thinking about have a few different versions as far as loading/memory solutions go. The faster PC I use does that kind of loading jitter occasionally too; but somehow doesn't skip a beat when everything is preloaded and just sitting in memory.
About the pics, you only get the 'naughty' (PG13) ones on the higher difficulties (Hellish or Nightmare)... and right after you beat the game. Not something you could get to casually or accidentally I think, unless you've already earned them and you're flipping through the gallery. Swapping them out with 'dummies' for such an occasion wouldn't be too hard though. About draw_set_color(c_black) difficult.
