That being said, the code enforcement or city inspectors will Red tag a project if it is not being done correct.

There are significant costs, time, and red tape involved.

The video with ten red flags you talk about people that want to plant gardens or flowers being a red flag.

I remember having a brick fireplace painted and they painted it bright red, very odd looking, our normal spec was grey but we didn't do a full scope as it was just a minor rehab, paint and carpet. 

They are looking to break their lease 3 months early (red flag) for a bigger space as they work opposite shifts and live in a small two bedroom. 

Anything above $1500 rent is cash flow so obviously, anything below $1500 is breakeven or loss.The market is red hot.

All it will likely do is confuse them and raise unnecessary red flags.

To me this is not a big concern because it is my plan to repipe after closing, then I will be able to show proof of the repipe and get the exclusion lifted.However, not being able to get insurance with FULL coverage due to the piping, I believe it would be a red flag for the lender and may be reason for a denial. 

When we get into the inside I see hairline cracks in the ceiling and on a few walls, big red flag.

Late rent is a red flag.