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.

Revealing: When Cuchillo is about to be shot by Isabelle, you can see the bullet-hole-effect go off to early, due to bad editing. It's exactly in between that scene when both actors are shown from the side, and as the scene changes to where Isabelle is seen from the front.

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.