Lol! It's interesting isn't it?!
So I read some more about it, alongside watching that clip. So the very very first version (and I also got this partially from NinjaKKN @ Spicy), which was in 2514 (1971), the actress supposedly got shot in the head by her boyfriend who didn't have intentions to kill her. They didn't have problems that day and no one knew why he did it, along with him. The actress was supposedly Christian and didn't pray for playing the role of Khun Ubol and also didn't go to the blessing ceremony. This wasn't mentioned in the clip but has been mentioned on different sites pertaining to accidents on set.
http://www.komchadluek.net/news/ent/207776
The second version, played by Ratnu Bunchuduang an incident similar to Noon happened. She went home to sleep after a long day of filming and said she saw the ghost of Khun Ubol. At first, the lady said her name was Bua. She didn't think anything of it, but then she said her name was Sarochinee after and got really scared. She then went to go tell the producers/directors the next day and mentioned that she constantly prayed and asked Khun Ubol to play the role before filming. No major incidents happened afterwards. Oh yeah, she also mentioned that there was one time that she could not remember her script/line AT all. When filming, she wasn't able to even read the words that were placed right in front of her. She said that there was something holding her back. When she went back to rest or whatever, she was able to say the line without any problems. She said she never had that problem before and is usually good with reciting lines. This was in the clip up above.
The third version also has the actress who played Khun Ubol up in the clip. She said one time when filming, she felt something pass her ankles/foot. When she looked up, she saw a spirit of a woman. She then lost consciousness and she couldn't recall much after that. Then one day after filming, I think they were all about to be done filming or so with the whole set, she wanted to play a prank on everyone as the ghost. She wanted to have some fun and thought it would be funny since everyone has been working hard and they're about to wrap up. They didn't end up finishing that day and she was tired and she went back home to sleep but her bed started shaking. She thought it was an earthquake because it lasted so long. Then she knew it was because she had bad intentions about using Khun Ubol's ghost to prank/haunt others. She thought to herself, she deserves it because she should have never thought about it or should do something like that in the first place. She asked her mom the next day if she felt anything shaking, but her mom said no. Lastly, I read from the website that the girl who played Tip in this third version got in a horrible motorcycle accident and had to be replaced. I'm not sure what happened there, but its pretty scary.
That's what I got from the clips/news sources. Anyone have more info? I might be wrong on some of those, my interpretation might be a bit off. Correct me if I'm wrong.
As for why Bee was replaced, the producers/production mentioned that it was because it was such a tedious lakorn that took a lot of time and effort to produce (wardrobe, history, etc.) and had to cancel it at that time. When news sprung out that it was going to be produced again, they decided to contact Noon (from what I heard). I'm not sure if there were any creepy incidents.