Did anyone else guess... (Spoilers)
**Spoilers below**
Did anyone else ask the question (before the movie even started): wouldn't the park eventually run out of zombies? And then immediately answer your own question with "they're probably secretly turning some group of unfortunate humans into zombies".
That's what I thought before watching the film and was obviously right. Don't get me wrong, I still enjoyed the movie and thought it was a nice surprise in the tired zombie genre, but I wasn't surprised in the slightest with the refugee "twist" at the end.