I was writing software at a bank and found a bug. I was told to save it for when we had our audit —- because no matter what, the auditors were going to insist we fixed something and it might as well be something the development team wanted fixed too. I’ve heard of contractors who leave electrical outlets out of their plans so that the building department, which will insist something be changed in the plans (proving the department’s usefulness), does not insist on something hard.