These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: The Ghost and the Darkness
Adaptation Displacement: There is not only a book (The Man-Eaters of Tsavo, written by the real John Henry Patterson) but an earlier film based on it (Bwana Devil, 1952).
Nightmare Fuel: Besides the lions themselves, there is also the hospital massacre sequence in which the lions invade the hospital tent and proceed to kill everyone inside.