Got these from the bank today. The $50 has an ink transfer like the one that CitationSquirrel got on his. Ironically, they are the same year (1990). Would it be considered an error note? Other than the fold, it is in phenomenal shape almost uncirculated condition.
In sub-Saharan Africa, the older small-portrait US bills (other than the $1 and $2) are not generally accepted. I changed a 1993 $10 bill with a fellow traveler at the Zambian border for a more recent one as they were having difficulty using it to purchase their visa for Zimbabwe!