One thing that stuck out was the consensus among all parts of the source that Motif sucks :-) I was also surprised by the number of comments along the lines of "This is a Hack for shipping 3.0beta4!!" that were never taken out later. I suppose this kind of cruft accrues in all really big projects.
Some funny bits excerpted:
ns/lib/libmime/mimehdrs.c # define terry_has_lost_his_mind_and_also_macs_suck 0
ns/cmd/macfe/central/medithyper.cp PissOnThisDocument(fHContext);
ns/cmd/xfe/dialogs.c #ifdef Motif_doesnt_suck
cmd/xfe/editordialogs.c: char* fuck;
nspr/src/sco_license.c: SCO has this whacked-out licensing library that's more trouble than
That last line was prescient :-)