Yes, it was deliberate
As Jack mentioned earlier in this thread, and MagicShadow9 mentioned on another, yes, the King of Clubs was definitely modified to resemble the face of a well known pair.
Take out any standard deck of Bikes or Tallys or any other over-the-counter (read: non-customized) USPC cards, and compare the court cards therein with the court cards of the D&D decks. For that matter, take the court cards from Centurions or Guardians and compare them.
You'll notice that the D&D courts are, for the most part, a simple modification of the standard USPC courts; mostly color fills that eliminate the line details of the originals. The one big exception is the King of Clubs, where the face of the King has been redrawn. The nose and mouth are particularly different from the typical style of the USPC court faces, and the eyes are also simplified. Compare this one to a "standard" King of Clubs, and you'll see it's definitely deliberate.
It's a nice effect. I like it. An Easter Egg!
My one disappointment with the design scheme is that the simplification of the courts doesn't jive with the sophistication (and the, er, complification) of the Ace of Spaces and the backs. It's like they are from different decks by different designers. Both design concepts are great, but they don't mix well (in my humble opinion).
Cheers,
--Allan
PS: the printing on my decks were also off-center, both fronts and backs, and the same was true with the Guardians and Centurions that I'd gotten with the same order. The off-center-ness is no more pronounced than I've sometimes found with the bikes I pick up at Costco. It's not enough for me to be all that put off, but it's enough that I noticed. Also, even though the amount of off-center-ness is the same in each case, it's more noticeable on the Smoke and Mirror decks. Not sure why, but it probably has something to do with the fineness of the design. It's also not as noticeable on the faces as the backs, even though they're off by the same amount.