There is no Dante and Silvio (preassassinations)
http://youtu.be/ctlVm6C3m9c
[Front-paged by stabguy]
Both Dante and Silvio appear in Cheaters Never Prosper memory. This is where you fight to win the golden mask. Preassassinating either of them has a different result. The first step in all this is to avoid teleporting into the fight ring by jumping into the water after accepting the challenge. This was originally discovered by Vanitas (LadiciusFMU on YouTube). Now for the preassassination part.
Dante Moro: Grab the guard you're fighting and move him at Dante to move him around. This is basically the exploit of moving characters who normally couldn't be moved in the game. When you move him near the edge of the nearby dock be careful that the guard doesn't fall in the water which would instantly fail the mission. After Dante has fallen in the water continue to fight the guards. When the cutscene happens Dante isn't there. This causes a glitch where the scene doesn't end and the mission has to be restarted to continue.
Silvio Barbarigo: Do basically the same thing with moving him to the water. I also did that to the guy heralding the fights. This time the scene ends and you are able to progress through the game. But even more hilarity occurs without those characters in the game. In the next scene the camera stays on Ezio (it seems the camera is focused on the herald during that scene). And in the final scene Ezio is on stage alone and Dante is handed an invisible mask.
Here is what the scenes normally would look like.
First scene:
http://www.youtube.com/watch?v=bX7eETuSxOo&feature=player_detailpage#t=74s
Second:
http://www.youtube.com/watch?v=bX7eETuSxOo&feature=player_detailpage#t=119s
Third:
http://www.youtube.com/watch?v=bX7eETuSxOo&feature=player_detailpage#t=186s
I recently tried this i thought i'd share this funny screenshot i took. After moving Dante i fought all the gaurds next to Silvio so they're all pilled up at his feet. 
You'll also notice Ezio's swords floating there which was funny cause they kept flickering.
altair confused me lol
funny thing about the exploit i didnt rly find it m controller did when it spazzed out XD cant wait for ACR ill find out many exploits asap :3 but for now ACR beta *bought a ps3 just to play it* :3
When I was filming The Nine Lives of Dante Moro, I asked Vanitas for an exploit to get Ezio out of the boxing ring. He said, "Okay. I will work on it." The next day... "Jump in the water."
The guy literally found an exploit on demand. Disregard his modesty.
I had an idea for another assassination of Dante during Nun the Wiser. This is the memory where Teodora and Antonio walk Ezio over to the Carnevale games. I'm not sure if this will work but you're welcome to make a video if it does, Aurel.
Okay, so you have control of Ezio until Teodora reaches her mark in the center of the Carnevale area. Then there's a cutscene where an emcee officially opens the games. Also onstage is Dante. This is one of those cutscenes where Dante appears a split second early, giving you an opportunity to assassinate him if you're in the right place. However, Teodora and Antonio stop walking if Ezio gets too far away from them. The stage is outside of this radius. I tried shooting Dante from the crowd (lining up the shot unlocked and standing on a chair to achieve the necessary height) but could never get the timing right.
My idea is to become Exposed and somehow get Teodora on her mark. The cutscene won't start while Ezio is in Open Conflict, right? Take the fight onstage. Finish the last guard with a grab-throw. That will give you a few seconds to get into position, equip the hidden blade, and mash attack while Dante appears. If successful, you may hear the sound of an assassination and leave Dante with a bloodstain for the cutscene.
It's a lot of work and I'm not going to get around to it. Good luck to anyone who tries it.
It's nice to know you guys like it. 
Do you think it would be equally as cool if Ezio wasn't in some cutscenes? I wouldn't be surprised if there was a way.
Yeah, any other tricks would be cool. I'd be interested to see how you'd remove Ezio!
Yeah, any other tricks would be cool. I'd be interested to see how you'd remove Ezio!
I suppose you don't want Ezio to be able to talk in those scenes either (because it only makes sense if he isn't in a scene). Bene, I'll try.
How much do you guys want to bet I wouldn't find something like that out? And I'm not just talking about using water to prevent teleportation since that only works in certain situations. I'm talking about when Ezio is animated for scenes instead of just standing there.
Knowing you, I would bet you can find something cool like that. Get to it - I can't wait! 
Nicely done!
Haha. Some very nice trickery there. Some amusing cutscenes as a result too!