For a particular show, instead of recommending to viewers to start at S01E01 (which might put people off the show due to that particular episode being distastefully vulgar to some), by default start at S04E01 (which was actually the first episode produced by Netflix after they acquired the show).

It turned out that this seemingly simple requirement went against a very deeply ingrained (almost fundamental) assumption in many places in their systems, that shows always start at the earliest available episode.

In the end, implementing this seemingly simple requirement landed up being (according to the streamer) a 4 month project.