Three additions:
1) adding "GCP" before "point" in 2 entries in a legend to the buttons, for consistency with the remaining legend entries (although I'm aware, that the final "P" in "GCP" abbreviation also mean "Point" - but this regards all resp. entries);
2) adding explanations, what "Link QGIS to Georeferencer" and "Link Georeferencer to QGIS" buttons actually do (it was not written anywhere and I had to look for this over the Net for a while)
3) adding a tip, how to avoid switching between "Pan" and "Add" or "Move GCP Point" when moving from one location to the other (I also did not find it at once).