(at around 51 mins) When Christie knocks out Helena during the rain fight, Helena is lying in a large puddle of rain water. In the next subsequent shot, she is lying in wet sand.
(at around 21 mins) From the scoreboard it can be seen that there are 16 fighters, Bass, Bayman, Brad Wong, Christie, Eliot, Gen Fu, Hayabusa, Helena, Hitomi, Jann Lee, Kasumi, Leifang, Leon, Max, Tina and Zack. The match-ups for the first round are Bass vs. Tina (shown), Bayman vs. Brad Wong (shown), Christie vs. Jann Lee (shown), Gen Fu vs. Leifang (shown), Kasumi vs. Leon (shown), Hayabusa vs. Eliot (shown) and Zack vs. Max (Max says this to Christie). This leaves only Helena and Hitomi as remaining fighters yet Helena is clearly shown winning against an (unnamed) male fighter.
We are shown Helena having a tattoo on her lower back (during the beach scene) and one on her neck (during the fight scene with Christie), but later in the fight, with her back to us, both parts are visible, but the tattoos have disappeared.
(at around 11 mins) When Bass is drinking beer on the airplane, the hand his beer is in changes repeatedly each time the camera changes angles.
(at around 21 mins) In the first round elimination, the scoreboard says that Helena defeats Hitomi when she is actually fighting a guy with short black hair and a yellow costume. Hitomi is a Japanese/German girl with long brown hair in the games.
(at around 59 mins) When Helena is fighting the female guards on the steps with two samurai swords, she hits two of the guards in the stomach with the handles, then on the head with the sword. But she actually never touches one of the guards, who still falls backward as if she was hit.
(at around 57 mins) When Helena is attacked by multiple foes she kicks cherry blossom at their faces. During the wider shots we see there are no cherry blossom trees around.
(at around 19 mins) When Tina is given a shot with a long needle, the needle can be seen retracting into the syringe.
(at around 32 mins) When Tina is in the spa with Zack and takes off his shorts, the line when she says, "You're wearing way too much clothing," her lips are not moving.
(at around 56 mins) When Weatherby is talking to Helena on the stairs, towards the end of the scene, a bounce card can clearly be seen reflected in his glasses.