I remember hearing about the US Airways flight that had an emergency landing in the Hudson river (the film 'Sully' is based on this). The plane sunk faster than it should have because the checklist item 'close the vents' was too far down to be completed before the water landing. In response, the checklist was edited and the item was moved further to the top.

Apologies for not finding an exact link, but here is the wikipedia article for the flight: https://www.wikiwand.com/en/US_Airways_Flight_1549