4 January is Bitcoin Day
en.bitcoin.it/wiki/Genesis_block The coinbase parameter contains, along with the normal data, the following text:
The Times 03/Jan/2009 Chancellor on brink of second bailout for banks
This was probably intended as proof that the block was created on or after January 3, 2009, as well as a comment on the instability caused by fractional-reserve banking.
The detail "second bailout for banks" could also suggest that in a supposedly liberal and capitalist system, rescuing banks like that was a problem for Satoshi. The chosen topic could hint at bitcoin's purpose.