Quoting myself:

Flight landed ~ 5 hrs late. Turnaround 892 arrived SFO just under 5 hours late.
Incoming 893 today will arrive 45 minutes late, but is delayed 3 hours 35 minutes due to "operational difficulties." My guess? Crew rest requirements from the previously delayed 893 the day before.

It's amazing how one issue snowballs and in some cases effects flights for days afterwards.

I take this flight often and as with me and I'm sure many others on that flight, they end up missing their connections and are stuck at SFO for another 4 hours.