Continuity mistake: The character Imam has a large animal tooth on a necklace. Later than 5 minutes and less than 25 minutes into the movie Riddick and Imam are having an argument where in different shots of the same scene two different necklaces switch back and forth. The first, which is a significant plot point later on, is longer and plainer then the embellished, more curved second one.

The Chronicles of Riddick (2004)
1 review
Directed by: David Twohy
Starring: Judi Dench, Vin Diesel, Karl Urban, Thandie Newton, Colm Feore
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This is the second movie, after Pitch Black, where Riddick with his strength and shiny eyes have to stop a horde and rescue a friend on another desperate planet. A bit more campy, but then it stars Vin Diesel, Judi Dench, Karl Urban, and Thandie Newton. Good for a look.
Toombs: [Arriving at Crematoria] If I owned this place and Hell, I'd rent this place out, and live in Hell.
Trivia: In the opening scenes of the movie there are several massive statues representing necromongers. These statues are also in the film Batman. They are right in front of the building when the goons announce that they will be running Jack Palance's company.
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Chosen answer: The animals appear to be somewhere between a minor-class mimic of their surroundings and emotionally-triggered chameleons. As a sympathetic gesture towards Riddicks' dominant nature, it may have been altered purposely, or it was the animals' native eye color, when unstressed.