Well there were several furs who seemed to have forgotten that there are 31 days in August, not 30...and booked tickets for the wrong days. Not sure what can be done about that though. ;-)
Things that could be mentioned for those travelling by train are DB's group discounts (both Gruppe&Spar and the discount for groups of 2 to 5 people), the Departure posters at stations, and the posters on platforms to show where a given carriage SHOULD be.
The biggest problem that people seemed to have was DB's optimistic connections between trains. In both directions, we had a 7 minute connection at Würzburg. Due to Engineering Work at Fürth, this became 2 minutes on the way out...to get from Platform 6 to Platform 11. We made it by the skin of our teeth, and even managed to board the right part of the train.
Admittedly that can be fixed by choosing the "Duration of transfer at least <x> minutes" option in the journey planner, but it's also worth pointing out. Though again, with there being direct trains from Hanover and Leipzig to Magdeburg, that shouldn't be an issue next year.
That's about all I can think of for now...
Cheers,
Southie