I think the fact that Goodman has always been about the wonder and strangeness of experiencing OD&D back in 1974. I mean they brought in all the “funky” dice because people these days are comfortable with the standard D&D dice… Even the art is pretty consistently 70’s (look at those bellbottoms):

Their Appendix N dedication also means they lean heavily into science fantasy and sword & planet stuff.
Continuing the trend is how much the DCC community has gotten into zines. Some of the earliest content for OD&D was in fan made zines… With DCC people are doing really fantastic stuff in zine format like Crawl, Crawling Under A Broken Moon (Which is where all the Umerican Survival Guide stuff came from (note: not published by Goodman)), Crawljammer (for running Spelljammer type stuff in DCC), and the entirely community-sources Gongfarmer’s Almanac. (Full disclosure, I have done editing for the latter.)
The funny part for me personally is that I just adore the content and the fact that it exists. (I’ve played like two sessions of DCC - the system isn’t really my jam - though tons of stuff in it makes me smile.) Mostly because it is so weird but somehow makes some strange coherent sense?