Funny thing about the 1951 UK result - in that election Labour set a record for the most votes cast in a UK general election for a single party that lasted until 1992 (it's still second), yet they still lost. I'm of the belief that whoever won that election would have been around for a few due to the post-war boom hitting, so that's a little annoying.
In 2 federal elections in the 1950s, the SPÖ won the popular vote but the ÖVP got a seat more.
I thought Austria used PR?
Depends on the form of PR used - I believe that Austria uses regional list PR with no national balancing seats so if the numbers worked out then you could end up with a wrong winner situation - although neither would have a majority so I suppose that it's less important really.