On Hernandez's 2005 Topps regular-issue card, the biographical information and stats appear to be correct upon a quick check on baseball-reference.com and other available media.
Hernandez's 2005 Topps Update card almost appears to depict a different person from the regular-issue card, but the discrepancy is located on the card back.
The card back states that Hernandez was born in California instead of Venezuela more than two months after the Hernandez in his regular-issue card. The card also has Hernandez drafted by the Twins in 2004, and listed as 2 inches shorter and 5 pounds heavier.
Apparently, there is some misinformation being listed on Hernandez's early Topps card backs.