The 'Winky Room' (found above the first single tire after midway) is distinct from bonus areas, as it apparently doesn't add to the game completion percentage.
The second 'Zinger cave' in the lower section after midway holds two Zingers, but since they overlap precisely at their start point, only one is visible on this map.
All Kritters in this level are of the jumping variety. Some jump in one spot (black Kritters), while others jump back and forth (bronze Kritters). Their starting poses are shown on this map.
Talk about this map on the DKC Atlas Forum: Mapping Project thread