For my current trip to Cairns, one of the resources I used was the Cairns WikiVoyage page. The page is of a decent length, and has guide article status, so I figured it'd probably be largely ok to follow.
However, I quickly discovered that the Get-In section was completely out of date, now fixed with help of Travel.SE! Several hotels were listed, but under names they no longer use, some under names not used for a long time (fixed where noticed). I then discovered from wandering about the city centre that there are a number of museums and gardens in the city, of which there were no mention (now fixed). I also spotted a few other problems, which I also resolved as best I could.
Luckily in this case, I had enough time and flexibility that it was all fine. On other trips though, it might be more of an issue.
So, what can I do to try to detect if a given apparently-OK-looking WikiVoyage page is fairly up-to-date, or if it's no longer likely to be current?