When Helena is fighting all the guards on the staircase, there are knocked out guards and a samurai sword lying directly behind her foot. In the next shot, they are all to the side so that Helena can run down the steps.
When the girls are climbing to the top of the compound area individually, they are approximately 5 stories away from it. In the next shot when they all work together to get to the top, they are only 2 stories below.
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.
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.
When Weatherby is in the lab trying to free the trapped, Donovan is seen running from the Buddha head to the lab on the LCD screen. A few scenes later when he is encountering Helena, he is seen running from the Buddha head again.
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.
The shoes on Christie's final showdown outfit (black tunic, black shoes) keep changing. "Officially" she is shown wearing pointy-toed black sling-backs with a kitten heel but throughout the entire final sequence, those alternate between this style and simple black ballet flats. When she is released out of the harvest pod, she is even seen barefoot, then seconds later, she's wearing a version of the black shoes again.
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.