Basically those are things that aren't coded yet. Water relies on an alternate palette being applied to certain parts of the level, which evidently isn't part of OpenJazz at this point. Those Technoir Jazzes are the reflective red water event, but that's not a behavior that OpenJazz recognizes so they just appear as standard sprite-unspecified objects. The Holidaius monkeys result from OpenJazz not having a detailed enough understanding of the JJ1 bullet ("attack") system. Most bosses have non-standard behaviors so it's not surprising they would be added pretty late in the game.