The common theme from this is definitely last minute fees. 

What if they break the lease is the most common one, accounting nightmare was another.

You do NOT sign  you can but its not common for you  to sign on a prom note agreeing to pay you. 6.

Like they want to file a Quiet deedRE is becoming over run with  OOS  BRRR ROI  COC etc etc.This type of thing is very common though in Aviation there is an abbreviation for nearly everything you do in Aviation. 

Another option to consider is using the space for Airbnb or mid-term rentals.Here in Texas, basements aren't common, but I found a home where the third bedroom had its own entrance right off the driveway.

Here is a common one I've seen stocked.

But that's been common for all areas I have invested in. 

You might see soft spots on the floors—they’re one of the most common mobile home faults.

I wouldn’t say that’s a common start for most people though.Also, you are 100% right that 99% of people will do nothing even if you give them a roadmap to working for themselves.

I can’t stress enough how important it is to stay focused and avoid some of these common pitfalls early on.Quick thoughts:Find the right Realtor – Make sure they’ve got some skin in the game with househacking or investment experience.Budget = Game Plan – That pre-approval is your marching orders.