At about 9 mins, when Ginger first approaches Beth-Ann, Ginger's face is fairly clean. In the very next shot, when Beth-Ann turns to face her, Ginger suddenly has a lot more blood dripping from her mouth.
At about 46 mins, Samuel says "Nice to see you" to Mrs. Martinez, who replies, "Nice to see you too." Then, a couple of scenes later, Samuel says essentially the same line--"Good to see you"--and Mrs. Martinez says, "It's good to see you too."
When Ruben feels for Jessie's pulse, he puts his finger in the wrong place on his neck.