Headscratchers / Love Lies Bleeding

• Lou leaves her apartment and then turns the key on the deadbolt lock, which locks Jackie inside. Later, we see that, indeed, the deadbolt lock has no knob on the inside that would allow someone in the apartment to lock and unlock it. Why does Lou's door have a lock that allows people to be locked inside? Furthermore, when Lou returns home, she finds that Jackie has smashed through the door's glass windowpane to reach through and unlock the door. But how would reaching through the window help her unlock the door if she did not already have the key?
  • It's very common for deadbolts to require a key on both sides of the lock. That's actually what you're SUPPOSED to do if you want it for actual security (Instead of show-security), specifically so that people can't just break the window pane next to the lock and reach inside to unlock it. That's normal. Now, how Jackie unlocked it from the outside by breaking the glass...that doesn't make sense unless Lou left the key in it.
    • I've never seen this, and it's my understanding that fire codes make it illegal to have doors that trap people inside. If Lou were that worried that someone is going to break her door window to gain entry, the safe and normal thing to do would be to either put bars over the window or have a door without a glass window in it.
    • That may be the case where you live, but fire codes vary drastically between locales (And also thirty years ago). This place is also a shady rundown apartment, so they just may not bother being up to code. I had one of those deadbolts in my childhood home, and we kept the key in a little tray next to the door for easy access while still being out of reach of the doorway itself.
      • I just assumed it was for a mite of protection, due to her criminal history. It'd make it just that slight bit harder to break in, might give her the extra moment needed to defend herself. Still, it's strange.