In the first fighting scene, Bi Han slammed Hanzo Hasashi's head on a huge rock, there's a blood splatter seen on the rock but Hanzo's head seems to be fine. And when they move from the rock, the blood splatter disappeared.
After Kano is stabbed in the leg by Sonya Blade @ 32:32 he limps for a few scenes and then the limp is "gone" 10 min later and the remainder of the film.
At final fight with Scorpion and Cole, Sub Zero open his mask, there is blood at his nose to mouth.
But, in the next scene, the blood at his nose suddenly disappear.
After having finished Sub Zero, Cole and his family leave the place, and one can see that the floor, which is supposed to look like it's iced over, is apparently covered with a cloth that wrinkles under their feet.
Before the $200 fight happening, Ally helped Cole put on his hand wraps. The camera focuses on his hands close enough and there were no additional pads beneath the wraps. But when the fights happening and the camera zoomed on Cole's hand when he taps out, additional white pads were seen popping out of the wrap.
After facing Goro, Cole Young hugs his wife and daughter. As he does, a seam can be seen on the back of his supposed metallic armor.
(~1:38:50) The fight promo poster next to the pivotal plot poster at the end of the movie has a date of Sat Dec 22nd. Recent years that could potentially be for is 2012 or 2018 (next are 2029 or 2035). Another fight promo poster in that same room has a date of Wed Dec 7th. Recent years that could potentially be for is 2006 or 2017 (next are 2023 or 2028). It would be impossible for those respective dates to fall on those respective days in the same year, so likely either made up dates or supposed to be for different years (neither have years).
At Sonya's hideout when Cole hears Kano's voice, Cole lifts up his left arm a second later Cole's right arm is raised.
After jumping off the plane, Cole's hair looks very sleek & his appearance doesn't look like he's just parachuting.
When Cole took his daughter for ice cream after his fight, Sub-Zero's snow is falling. When the diner's window in front of Cole and Ally starts frosting and crackling, they seem not amazed/bothered at all and continue to be amazed by the snow outside instead.
In the fighting scene with sub zero and Cole when the floor is frozen, it can be seen that due to characters moving there are wrinkles in the fake sheet of snow.