Coming in from the garage I looked at the door and it wasn't exactly unhinged, but their thinking wasn't complete.
This happened to be new construction, but I have seen it on older homes as well.
Door manufacturers sometimes ship their doors with only a couple of screws in the hinges.
Then they include a pack of screws for the installer to finish the job.
All the door installer has to do it fit it into position, shim and plumb it, and secure it to the framing.
Notice the hole on the left side of the hinge. It is intentionally left without a screw.
Why? Sometimes they include one for this hole and sometimes not. But that hole is for a long screw to be used to secure the door strongly into the double stud in the framing.
I OFTEN SEE THIS HOLE LEFT UNATTENDED.
But on this house they forgot the rest of the screws too!
No matter. The door is usually closed nobody will notice.
I am going to bet it was more basic than this. None of the hinges had more than one screw! And I don't think they were forgotten. I think the installer simply did not know.
This sort of thing is happening more and more. The word "PROFESSIONALISM" is missing from so many trades these days.
I THINK THE TRADES ARE BECOMING UNHINGED AND UNTRUSTWORTHY IN MANY REGARDS, BUT ESPECIALLY IN NEW CONSTRUCTION.
AND IT IS A SHAME.
My recommendation: if it's true that people simply don't think things like this will be discovered, that is all the more reason to hire a professional home inspector to look around. People ask me what the most common things are that we find on new construction inspections. The answer it that it's everything - nothing is common! Every inspection is different.