Smejki got anything to add/remove on these?
https://old.reddit.com/r/kingdomcome/comments/xd8raa/kcd_tidbits_not_many_people_know/
1) Originally the game was supposed to start at the Battle of Grunwald (1410) aka the largest medieval battle in Europe. I assume it was just supposed to be a cutscene with older Henry fighting, record scratch and voiceover "You're probably wondering how I ended up in this situation", then flashback to Skalitz. Possibly at some point the story would go back to 1410 and you would actually play at the Battle of Grunwald. Maybe at the end of the first game or in the second game. This technique, where the game is told in a flashback and then goes to the present and continue, was used in both Mafia and Mafia II, so it makes perfect sense to me.
Furthermore the developers confirmed during Q&A in 2015 that most of the game would take place on a big map and then there would smaller maps outside the country where only a small part of the game would take place. This obviously didn't happen for whatever reason.
We know there was a guy named Jan Sokol of Lamberg at Grunwald, a buddy of Radzig Kobyla. He's in the codex. We also know that there was a mercenary serving under Sokol at this time, one Jan Žižka of Trocnov (even though he's not actually confirmed at Grunwald, just at the siege few weeks later). That would nicely introduce Henry to Žižka and KCD could continue the story up to the Hussite Wars in games 2 and 3. BTW, yes, in 2015 they said would like to make a trilogy with the same main character and the proposed 3 acts would form just the first game.
You can see the Grunwald battle in the original Kickstarter trailer
2) Originally Tom Weston-Jones was cast as Henry.
They even scanned his head and everything. You can see his character in the first Kickstarter alpha:
If you think that looks bad, bear in mind when they first put Tom McKay's head in the game it looked like this:
In the end Tom Weston-Jones had to drop out because he signed to do a Troy tv show.
3) At some point they wanted to cast Luke Dale (Hans Capon) as Henry, since they loved his acting. However they decided he's too funny and Henry should be more serious, so they cast him as Hans Capon instead.
4) The role of Henry's father was written with Sean Bean in mind. They negotiated with him, but he turned them down. In the end they got an actor who sounds almost exactly like Sean Bean, but was much cheaper.
5) They also originally wanted Brian Blessed to play Sir Hanush. However they didn't realize that he's 80+ years old and would not be able to do all the motion capture recording, so they cast him as Konrad Kyeser.
6) Originally the prologue in Skalitz was supposed to take place in winter. Then the rest of the game would be in spring after Henry heals from his injuries.
7) Matthew and Fritz were not supposed to be Henry's childhood friends. They were just two scoundrels he meets in Ledetchko later in the game and starts doing quests for them.
8) Petr Jákl, the director of the Medieval movie about Jan Žižka is Runt's model in KCD