That's not a "weird, comma-infested URL". That's the title of the page.

The only Cool URI failure on Wikipedia is the ".m" which is added to the mobile view.

one wonders why this is still the case after all these years...

Because Jimmy Wales :didn’t get enough money :(

Wikipedia gets a pass from me because the comma is part of the name of the actual film.

I may have misunderstood your initial comment. Was Vignette a nemesis because letting people migrate to Django from it while preserving URLs involved commas, or was it just a nemesis in general and you're pointing out a flaw in how they did URLs? If the latter then yeah there's no point in me mentioning a mainstream use of commas in URLs.

We just thought that having URLs with obfuscated IDs and multiple commas in them looked really ugly.