Other mistake: In the scene at the beginning where Phil eats Jason's Heart, you'll notice that he screams like a monster for a bit. Don't you think that the two security guards would easily hear the screaming and intervene, being that they're in the very next room? (00:13:40)
Other mistake: When Robert, who is possessed by Jason, is reaching through the car window to get Jessica and Steven, you can see his reflection on the car hood. This reflection should show Jason, as we've already seen in the movie that the host body Jason is in should show Jason in any reflection. (01:00:50)
Other mistake: Where were the crime scene people? Jessica goes to her mom's house and her friend from the diner is cleaning up the blood? Highly unlikely.
Suggested correction: We don't know how much time has passed since she was killed. Crime scene people would have come and gone. And what's wrong with her friend cleaning up the blood? She's just being a good friend.
I highly doubt in a murder scene the police would make you clean it up! Think about that.
That's absolutely what happens: https://www.aftermath.com/content/who-cleans-up-murders/. https://www.biohazardresponse.com/blog/three-things-you-need-to-know-when-your-home-is-a-crime-scene/ Once evidence is dealt with, everything left isn't the responsibility of the police to clean up. Most people would hire cleaners rather than do such an unpleasant job themselves, but it's the responsibility of the property owners to clean.
That's just your opinion. Unless you know police procedure in every state then you can't make that assumption.
Other mistake: When Jessica first goes to her mother's house after her murder, her friend asks why she didn't tell her about the baby. Jessica says she was going to tell everyone but didn't expect to be back so soon. She just told her mom on the phone she was going to visit the following weekend so yes she did.
