When attempting to view an old revision of an article (eg http://en.wikipedia.org/w/index.php?title=Ggplot2&oldid=532258481) on the mobile site, Special:MobileDiff intervenes and shows the diff view rather than the old version of the article (eg http://en.m.wikipedia.org/w/index.php?title=Ggplot2&oldid=532258481)
I believe this is because Special:MobileDiff is taking over when it sees 'oldid' in the query string.
Version: unspecified
Severity: normal