Predators (2010)

Continuity: When Royce kills the Predator at the end, he slices the head off, and it falls backwards, and the body falls forwards. One of the next shots now shows the head to now be in front of the Predator body.

Continuity: When Royce is running around the last Predator hitting him with an axe, the plasma caster on the Predator's shoulder changes from left to right between shots.

Continuity: When the group choose to leave Cuchillo behind and Isabelle decides to put him out of his misery, there's a fraction of a second where you can see his would-be-bullet-wound on his back explode from a supposed bullet impact without the gun being fired as Isabelle takes aim, only to go off again after Isabelle shoots him in the following shot.

The famous line from the original Predator "You're one ugly motherf**ker" is included in Predators, but most people have missed it unless they speak Russian. Nikolai says the line before blowing himself up.

The creature that hunts down the Doctor before being shot down by the Sniper girl is actually the original design of the Predator that was scrapped during Predator 1 due to issues with the costume and the jungle. The original Predator was supposed to be very slender with backwards knees and long arms, but because of the jungle setting, it was scrapped because the director was unable to make the costume work properly.