There's something I find odd about movies from the 70's or earlier. I watched Silent Running recently (I was on Douglas Trumbull kick), and aside from the outrageous hairdos and terrible (by todays standards) special effects, the thing I noticed the most was the sound and pacing. It seems like shots were often overly long, and accompanied by almost complete silence. I know there were a smattering of movies in that period trying to emulate Kubrick's style in 2001, and a few more recent examples (Moon (brilliant film), Solaris (not so brilliant)) but I've noticed the same pacing anomalies in older films as well. I don't know what happened in the 80s which resulted in the quick-cut, fast pacing that we tend to see most of the time these days, but there's definitely a divide there.
I almost wish I had paid more attention in my film classes at University, maybe then I would know these things.