Last modified: 2013-11-25 13:38:25 UTC
See https://en.wikipedia.org/w/index.php?title=Wormshill&diff=564367057&oldid=557770558 for example.
This is caused by an unbalanced <blockquote> in the infobox, which "works" (ish) in MediaWiki's PHP parser but didn't in Parsoid at the time; this is subsequently worked around. Closing as WORKSFORME.