I was a spectator in Chicago in 1984 at the 20M mark. A WBBM-TV (local affiliate) mobile truck was there, doing live cuts from the course. I peered inside the truck's window to see a live clock of the race superimposed on a monitor. The 20M split was well inside WR pace (Jones, Deek, and Lopes were leaders, but Jones was the guy pushing) so I told the on-air reporter *rather excitedly* that they were definitely ahead of world record pace. He asked me, "Are you sure?" and I must have been convincing because he went live and began shouting "They're ahead of world record pace!" into his mike.
The course was run in the opposite direction as it is today. Watching Jones break Deek and Lopes as they went hauling up Ashland or whatever street that was (Wellington?) and seeing two great marathoners crack in his wake was an amazing thing to witness.
My girl and I hopped a cab near Wrigley Field after that and headed over to Marine Drive to catch the leaders at the 25M mark. Jones was absolutely flying, his singlet drooped over his shoulder. Amazingly, there weren't many spectators at this point.
I'll always believe I was right at the spot where Jones sealed his legacy. Watching Deek and Lopes droop their form because they knew they were cooked kind of proved they were mere humans that day. Jones was definitely from another planet.