When introduced in Triangle (2001),Olaf is simply a troll. When the group is preparing for the final battle he has somehow been promoted to "troll god".
When Glory gets Dawn ready for her big ceremony, Dawn is getting anointed with some black stuff on her forehead. In some of the frames the anointment is there, in the next it's gone, and a second later it's back again.
When Buffy throws herself off the tower, she is facing downward; later, when she is shown lying on a pile of rubble, she is facing upward.
At 24:07, as the camera pulls back from Dawn, along the top edge of the screen you can see over the TransLight backdrop that is providing the cityscape behind her, into the studio beyond.