Now, I didn't see all of the Olympic opening ceremonies (I got in somewhere around the L's in the parade of nations, and watched through the rest) but I understand that there was a certain segment of the population that was a bit miffed that a particular very long-running British sci-fi show didn't make it into the program, despite being on the air for fifty years.
I then heard that the Dr. Who segment had been "cut due to time", which I thought was painfully ironic ... so much so that one might even entertain the notion that they intentionally cut the segment just to be ironic, but maybe I'm just over-sensitive to hipster-isms. I hear tell the only surviving nod to the show was a brief bit of the theme that was in another segment. I suspect the Mary Poppins thing (which I didn't see, but saw a pic from) would have been far more interesting had it involved Daleks.