Castello Exploits (infiltration, get in the huddle, preassassinations)
http://www.youtube.com/watch?v=01lQRSr2EB4
[from the forums - stabguy]
Here are some exploits in the Castello:
Infiltration. After you've been in the Castello the original way will be blocked off. If you have unlocked the parachute you can get in by climbing up to the right of the bridge.
Get in the huddle. You can grasp a ledge that will allow you to climb up to a place to get in the scene by climbing. Climb to the left to get above them and drop down to get in the huddle. Also if you go far enough on the roof you will get a checkpoint, skipping the scene. After the scene you are unable to attack the targets normally and they will disappear.
Preassassinations. You can tackle a target after the scene. You can then do a prone assassination which will then cause the other targets to stay there as long as you don't get too close (listen to what one of them says right before the prone assassination for some humor). I killed them with throwing knives, but didn't get Cesare because he had gone through the gate. You might be able to get him if you are fast enough.
Infiltration is doable without exploits and without the parachute. You can get in by walking into the courtyard (the entrance is near the group of 4 papal guards), use the ladder there, then walk for a bit and jump over the wall. This is done in the second castello mission, if I'm correct.
Aside from that, great job! 
Oops (I didn't get to that part in the story yet). I assumed it was impossible because I heard you needed a key to get in. And sorry if it was all rushed. 
Great vid!! Ur assumption that u needed a key underlines ubisoft's utter failure to actually make the castello difficult to get into, I loved the pre-assassination btw 
Thanks. Yeah, the parachute could still be considered an exploit since you are not supposed to get in there that way (that is why it's blocked off after you've been there once). 
Okay, I tried preassassinating again and got a few results.
I quickly threw the throwing knives after the prone assassination and got Cesare and the two remaining targets in one shot even though he was part way through the gate. 
I tried throwing the knives without a prone assassination and they weren't affected.
I tried poisoning someone after tackling them instead of a prone assassination and he disappeared right when I poisoned him, but there was a small blood splatter.
You can also tackle them while you're on the ground.
So that is how you can kill four of the five main targets early in the game.
I just cant seem to grab that lantern (Get in the huddle or Pre-assassination) im playing on PS3 and when i try to jump from the wall on to the Lantern, Ezio decides to miss it completely. Am i doing something wrong?
The jump has to be aimed nearly perfectly. However I think there is another way. If you are detected the scene won't start, so get detected and escape detection while hanging on the wall (if you go on the roof stay crouching on the edge because if you go on the rooftops it will skip the scene entirely).