Why did Angela react that way the first time she saw Bosco?
That was one of the most unrealistic and weird things in the movie. Why the hell would she freak out like that and start running away from him? He had a camera, yes, but a lot of people have cameras. I understand she was shaken by the tape she had watched and on the look-out for the potential killer, but it is completely irrational to just assume the first person you lay eyes on who happens to have a camera is the killer. It would be understandable to get a faint suspicion, but not to actually freak out and start running just because he happens to walk behind you. She was admittedly right about him being the killer, but it was pure coincidence. Female intuition put aside, it was pure luck. Not only was it weird and hard to believe anyone would react that way, it was also stupid because if you really think you've seen the killer, the best thing would be to act cool. You don't want him noticing you and realizing that you might be on to him. Her nervous reaction is what drew his attention towards her.
Another unrealistic thing is that she would walk in on her dead professor and her first reaction would be to steal the tape and run off without alerting anyone to that she had found him dead. If she wanted the tape so bad, she could have replaced the tape with something else and then gone to the police. I don't buy that a young, innocent college student like that would do something like this. And the fact that she wouldn't hand the tape over to the police even after she realized it was a snuff movie with the murder of a disappeared college student. I mean, the idea of trying to investigate something like that yourself is ridiculous to me. No one would do that. Once you realized the gravity of the situation you would hand the tape over to the police. You could even lie about where you found it if you don't want any trouble, but for the love of God don't try to play detective on your own.
And please don't give the same old 'it's a movie, it doesn't have to be realistic or make sense'. I'm sorry, but I have a brain and I refuse to check it at a door just because I'm watching a movie. I mean, would you have thought it was okay if Angela had started to tap dance when the lights went out in the basement? No, because that would be a pretty unrealistic and silly reaction to the situation and we want the characters to act realistically.
Also, I wonder what happened to her keys that she lost? They probably fell out of her purse when she was being chased by Bosco. Angela has a nightmare about Bosco using the keys to sneak into her house at night, but that was as stated, just a dream. So what did happen to her keys?
And why did Bosco and Chema fall out? They used to be friends but stopped speaking to each other. Why? Was there ever any explanation?
I'd like to add lastly, that I did like this film and thought it was pretty good, with the exception of a few things that I had a hard time buying.