There’s nothing worse as a journalist than a mistake creeping into your copy and then published for all to see in print or online.
It would appear to be much easier to correct online, although realistically once live there’s no real recall.
It may have been sent out on distribution lists or caught by screengrab or a smartphone photo and shared ruthlessly on social media (yes, I’ve done it too).
And if it’s in print – it’s there to stay.