In the HBO, there were a handful of times when I'd add the HBO cards to my cards and end up with a pile of dupes. Sometimes they were simple base-card dupes. Sometimes they were low numbered autograph cards.
Take for instance the UD Signature Premier cards below. The blue cards are numbered to /45 and the gold cards are numbered to /15.
As my Hochevar player collection gets deeper and deeper along, I'm guessing that these instances of duplicates will occur more and more, which is cool with me.