When the error was realized and the passport retrieved from the pocket of a shirt in the dryer, it was certainly damp and the cover and many pages had curled, but perhaps it can be reflattened by a stack of heavy books or something. The ink on the pages, including one important visa, seem to be fine and still legible. Not sure if there's some microchip or something which is now hosed, though. This is a fairly new US passport issued late 2013, if it matters.
Asking for a friend.