Inspection Contingency Question

[David Hodge]

First off, I'm currently reading The Book on Rental Property Investing by @Brandon Turner and it rocks!  It gives so much more practical advice than most RE books I've read so far.

Now to the question... the inspection contingency allows you to back out if something comes up in the inspection that you didn't expect, but there is ALWAYS going to be something you didn't expect.  Can I back out if I find out a door knob is lose or there is a tear in one of the window screens?  I can't imagine a buyer could back out for minor things like these.  If they could, they would always have a way out because reports are always full of minor issues, even on well maintained homes.  So where is the line?