I'll forgo a synopsis of 'This House Has People In It" because one can find and read it elsewhere.
At first I thought the idea of using only security video footage to tell a story was a novel and interesting one but when the point of view changed such that it was impossible for the security camera to have captured it, the effect was jarring and annoying. That was my first gripe.
My second was the response of the couple when they realized the unconscious girl had a problem. Who would not call 911 immediately? But they didn't and their odd behavior failed to suspend my disbelief.
Then there was the peppering of viewer YouTube videos explaining THHPII. Most of the videos were longer than the original, some much longer. If a story needs to be explained then perhaps the story wasn't told well. I understand vague references are clever. I delight in esoterica but inside jokes and obscura do not a good story make.
This House Has People In It spent too much time trying to show how smart it was. The final result was not as bad as, say, Plan Nine From Outer Space, but it wasn't nearly as much fun either. But it was mercifully shorter.