The tent is one color when the piñata grabs Lisa, and a different color when it pulls her inside.
The creature grabs Lisa by her neck and shoulder, and starts dragging her head first. In the next shot, she is being dragged feet first, with her head down.
During the escape attempt, Tina handcuffs the Molotov cocktail to the back of the monster's head. In one shot, the bottle falls to the ground. In the next shot, it is back on the creature's head.
At the end, the girl runs at the creature and says "How do you like this, motherfucker?" with her mouth shut.
Around 00:19, you can see a radio in the back of Tina's short as she is sitting next to the water with Bob.