It can be all authentic if people are unprofessional. If they use Times New Roman for their advertising pamphlets and use both bold face and underlines – the type which cross through descenders, naturally – for highlighting the ‘important’ parts you may consider it sweet. If they don’t manage to consistently write the currency sign in the same position or can’t decide whether or not they want to put spaces before punctuation signs, you may think they are careless.
But if they only realise they wrote
Scheißfuß (shit-foot) instead of
Schweißfuß (sweaty foot) after printing their pamphlet, you may be tempted to think that they should get a clue and just throw away that stack of paper rather than correcting that typo afterwards with a pen and sending it around anyway:
Received data seems to be invalid. The wanted file does probably not exist or the guys at last.fm changed something.