The On-cartridge Gameplay Demos of the DKC trilogy!
I know, I know... in-game demos are never terribly exciting. It always seems that whoever is recording the demos is playing the game for the first time... but dull as they may be, they are a facet of DKC gaming which I haven't heard as a topic of discussion before, so here's a topic just them!
(I personally think Nintendo ought to have hired Arne or Tompa to show what the DKCs have to offer, but hey...

Okay, the demos of DKC2 and 3 are ones you've likely seen at some stage, but something surprising that a little birdy just told me is that DKC's Japanese release has its own gameplay demo, too! It wouldn't win any awards for awesomeness, but the gameplay is somewhat competent. After the game intro, a short (20-30 secs) gameplay demo is shown for a level (Jungle Hijinxs first). Then after another showing of the intro, another level is demo'ed, and so on. In DKC2, the demo differs slightly from the PAL version to other regions. The gameplay shown is terribly uninspiring in all versions, but it seems that the NTSC and JAP versions are actually out of synch or something... At least by the time DKC3 came around, the demo's actually had a little polish and variety to them, and even showed some of the game's interesting and unique tricks.
The main surprises for me are that DKC was given a demo for the Japanese release only, and that DKC2's demo gameplay is attrocious, and even out-of-synch in most versions. It's also interesting to note that both of these games' demos begin from a continue barrel. Odd that... Well, if anybody feels like discussing these rather peculiar things, or indeed anything else regarding the gameplay demos of DKC or its sequels, please... be my guest!