I did come across a story a while back, where a card company gave a professional wrestler x amount of cards/ stickers to sign. When these cards/stickers were returned to the company,the company asked the wrestler why there was such a variance in all the signatures, only for the wrestler to turn around and say 'friends and family helped me sign them'. So no one is immune to such type of errors but quality control (such as here) should pick up on it.
Night owl trawling and I'd thought I add to this, with a similar story.
Devonte Smith-Pelly, a winger for the Anaheim Ducks, used a stamp for his auto on 5 different products in the 11-12 season, two produced by Panini (Contenders and Prime) and three produced by Upper Deck (SP Authentic, Ultimate Collection and The Cup).
It was a real eye opener given both companies have authenticity disclaimers. Especially Upper Deck whose disclaimer specifically states their cards are signed in the presence of a company representative.
Link
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