Continuity mistake: After Johns dies and Riddick is talking to Fry you see in one shot that only the bottle that Fry is holding is lit up, yet in the very next shot you see that all three, Fry, Jack, and the Muslim kid's bottles are lit. (01:23:40)
Pitch Black (2000)
Ending / spoiler
Directed by: David Twohy
Starring: Vin Diesel, Keith David, Radha Mitchell, Cole Hauser
The group don't understand why the aliens can keep track of them, that is when Riddick explains them that Jack is a girl not a guy and that she has her period and the aliens are smelling HER. The fight and run for survival ends with only three survivors Riddick, Jack and the Islamic Cleric when the manage to get off the planet in the skiff. Then they decide to tell whoever they meet that Riddick died on the planet to give him some freedom.
Jack
More mistakes in Pitch Black
Riddick: I truly don't know what's gonna happen when the lights go out, Carolyn, but I do know, once the dying starts, this little psycho fuck family of ours is gonna rip itself apart.
Question: When Riddick says that the monsters can track them because the girl is bleeding, and Jack is revealed to be a girl, is it her period that he is talking about? Did Riddick smell it, too?
Answer: Yes, it is her period. Considering that he lived in darkness for years, it's possible that he smells it too. It's also equally likely he realized she was a girl and that the creatures were all riled up and put two and two together. But the first explanation fits Riddick's character better.
Grumpy Scot