Yohan Blake is reported to have said that Bolt commented before the 4x100 by how long they had been waiting to come out onto the track, possibly due to Farah's long final lap of glory and 2 medal presentations.
http://www.bbc.com/sport/athletics/40914458
I know the NBC coverage that was supposed to end at 5 Eastern sure went long. The race hadn't even started by then.