Steve McConnell in the excellent book Code Complete talks about this sort of stuff. One of the big things was unused variables. Completely harmless, but a good indication that the code may have problems. If whoever is maintaining the code didn't bother to remove useless variables, what else are they not bothering to take care of?
It's not, keep the code squeaky clean because cleanliness is next to godliness, it's keep the code clean so it's easy to read. Keep it clean because it's a discipline that will pay off when it's time to spot/fix the real errors in the code.
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It's not, keep the code squeaky clean because cleanliness is next to godliness, it's keep the code clean so it's easy to read. Keep it clean because it's a discipline that will pay off when it's time to spot/fix the real errors in the code.