| Spoiler Alert!|
This page contains details about the plot which may lower your enjoyment of the books and/or movies. Discretion is advised.
In the book, there were only two groups: Group A and Group B. In the movie, there are more than two groups. It is unknown how many groups there are, as it was never mentioned. Since Groups A and B had a particular ratio for gender (Group A having all boys and one girl, Group B having all girls and one boy), it can be assumed that some of the extra groups were mixed.
2. Character Appearances
In the book, Brenda is described as having long brown hair. In the movie, she has a pixie cut hairstyle.
In the book, the character Jorge is described as being in his late 20s to early 30s. In the movie, he appears to be around late 40s to mid 50s.