There's a total of 17 times with negative durations currently. I think I can eliminate a couple though.
Booth's 49"92 TT Non-SC flap, done on 1998-09-30.
Penev had 49"90 done on 1998-09-13.
There's a snapshot of Booth's times on 1998-09-18 that lists his current PR at 49"95. Thus, I think it's safe to say that it was never a WR.
Booth's 1'46"70 KD Non-SC 3lap, done on 1998-09-30.
Penev had 1'46"64 on 1998-09-13.
Booth's 1998-09-18 snapshot lists his PR at 1'46"83. Also pretty certainly never a WR.
Booth's 2'31"76 TT Non-SC 3lap, done on 1998-09-30.
Penev had 2'31"70 on 1998-09-13.
Booth's 1998-09-18 snapshot lists his PR at 2'31"98. Also unlikely to ever have been a WR.
I jotted down the info on these times in a spreadsheet in case new info comes to light, although that seems improbable.
That brings the total number down to 14

I'm sure there's more that can be eliminated, too!
Also, could we implement a Source link category for the editing version of the site? Similar to the F-Zero version (
http://www.fzerowrs.tk/x/display.php?track=Mute+City), but with hyperlinks. It would be really helpful.