Gen's (Cerina Vincent) bottom half of her shirt gets shorter and shorter as the movie progresses.
After Gen steals the necklace from the old man, you see her holding it in her hand. In the next shot though the old man is still clearly wearing the necklace but in the following shot it's gone and Gem is holding again.
Near the end of the movie when Malik and Gen are in bed and Malik is dangling the necklace, you see his hair change positions from one shot to the next.
Wes is wearing a back pack. After Wes falls through a hole...he switches from wearing a back pack to not wearing a back pack to wearing a back pack again for the next several scenes.
After Gen runs outside to greet Wes, the image is reversed. You can tell, as the name on Gen's shirt is reversed and the logo on Malik's shirt is reversed. This appears to have been intentional, to maintain the continuity of the vehicle being on the right and the house on the left.