It seems like bug reports about truncated posts come up a lot on Meta. (And those are just four that I found in a quick search, I know there are more.) It all goes back to a bug on the server-side markdown-rendering code from way back in Fall of 2008. (Edit: looks like it was a little more recent than that.) The bug manifests itself in obviously-truncated posts, or posts where formatting from the post "leaks" to the "edit | flag" links. There are still some rogue posts which haven't been edited in over a year that have this problem.
I propose that the team solve this problem at the source, by re-rendering the markdown to HTML and invalidate the cache for all posts with a last-edit date before 2009-01-01. (Edit: or whenever the bug was fixed.). I can't imagine that there are that many posts which haven't been touched in over a year, and you could do it in a batch process during off-peak hours.