I usually don't bother including every single change in the changelog, especially not the ones that I don't know the details of myself, but here's what aylo1 added:
European Byzantium:
*) Botaneiates family (names, traits, birthdates corrected; now Prince of Turnovo)
*) Apokapes family (names, traits, birthdates corrected; now Prince of Karnuva)
*) Trajan Kometopoulos is dead (1065)
*) Future emperor Mikhael VII given nickname 'Parapinakes', traits corrected, given vassals to make him more likely to be elected
*) Georgios Monomachatos (future Prince of Dyrrachium) added -- this was supposed to be the count of Corfu in this update
*) Synadenos family (names, traits, birthdates corrected; now part of Vidin/Serbia)
*) Georgi Voiteh (major Bulgarian noble) added
*) Palaiologos family (names, traits, birthdates corrected)
*) Basileios Kourtikes added / changed
*) Major Byzantine historians & statemen added (Ioannes 'Skylitzes' Thrakesios, Mikhael Attaliates, Theophylact Hephaistos)
*) Multiple friendships between Byzantine nobles added
Asia Minor:
*) Ioannes Bourtzes renamed to Theognostos
*) Konstantinos X Doukas' son renamed 'Konstantios'
*) Mikhael Psellos's name fixed, given 'proud' & 'sceptical' traits. Also gold, prestige & piety.
*) Caesar Ioannes Doukas given 'energetic', 'indulgent' & 'intricate webweaver' traits.
*) Andronikos Doukas (son of Caesar Ioannes) relocated to Nikomedia together with family, trait/stat changes
*) Zoe of Nikomedia (wife of Caesar Ioannes Doukas's younger son Konstantinos) now plain Zoe (until we discover her lastname).
*) Created Anna Doukaina - future wife of Georgios Palaiologos & big sister of Alexios I Komnenos's wife Eirene.
*) Bryennios family changes
*) Changes to Alexios I Komnenos and Tatikios (age, traits, location)
Asia/Near East:
*) Corrections to children of Aluzian Kometopoulos (dynasty, location)
*) Changed Count of Taron to Grigol Bakurianis, made part of Mesopotamia
*) House of Lampron given dynastic name 'Pahlavuni', vassalage changed
*) Made Philaretos Brakhamios Prince of Mesopotamia
The above is maybe a bit misleading -- aylo is a good modder and gives me the modified entries directly, so I don't even need to create or edit the characters: all I really need to do is add his info into the scenario files and make sure they do not conflict with my own changes.
That's how I ended up accidentally making a De Hauteville countess of Corfu -- Aylo chose in his updates for Georgios Monomachatos a free ID, but in the mean time I had already picked the same ID for a different new character, so I needed to give GM a new ID.
Then I overlooked that I had given the new entry for Georgios Monomachatos a different ID in the characters file when I edited the country entry for Corfu.
Since I can't check everything (mostly I do a double check nothing crashes and there are no game over situations, and that the DVIP is functional without the Addon because not everyone uses it), these smaller errors tend to slip through.