Same squeaky door sound used over and over
At the first scene of a door opening, there is a sound effect of a door squeaking. It's the same overused squeaky door effect that is used in thousands of movies, and I dare say it is even more of a cliched sound effect than the Wilhelm scream. And it's almost like the makers of Harbinger Down wanted to make an ironic point of just how overused this sound effect is, because after that one first scene of a door opening, they use it again on the next door, and then again. And again. And again. And AGAIN! AND AGAIN!
If you google "squeaky door sound" you'll find hundreds of different sound effects, which you can use for free. Or you could just go find an old door, and record the sound of it being opened and closed a few times. But whoever was in charge of sound design for this film just kept on using the same sound, over, and over, and over. And they keep using that same sound on every frigging door, to the point where it turns into a joke. If you made it into a drinking game, you'd get wasted before 20 minutes had passed.
Budgetary issues aside, this just tells of lazyness.