If possible, please post pictures of your features, transformations, tips, etc. If not, thanks for trying, we'll figure it out.

Movie:
1.) Barricade head: Put it in place for robot mode, and then pull up on it. You'll notice he has a neck. (it doesn't turn, but it's there.) You can now close the hood more, and the base of the head will rest on it. (Makes him look a little taller too.)*
2.) Jazz
Arms: Look where the hood locks in place in vehicle mode, you'll notice a small tab on each side. Notice the black bar that holds the hood to the fender, now pull it all the way until it clicks. Form the arms the way you would normally, but now you'll notice that the arm is thinner and has less of a gap. Those tabs I mentioned earlier, will hold onto the outside of Jazz's elbow. This reduces the hole in his forearm, makes a tight connection, and correctly places his claw right under the headlight. (NOTE: this will slightly stress the plastic on hinges a bit, but not enough to promote breakage.)
3.) Megatron
Hand/Grappling Hook: Remove the spring from the weapon on the left arm, and install it in the right arm. Grappling hook will now fire, and with quite a bit of force.
Cannon: With spring removed, the weapon will remain fully functional and stay open. (So many people had problems with this.) Flip cannon into place for weapon mode, and if you look closely, you'll see what looks like a track on the base/hinge of the cannon. It allows the cannon to slide on the hinge so it sits in the center, rather than off kilter. (First try, the cannon will slide off completely, because the simplistic catch doesn't do a great job, but do not panic. The cannon will not be broken, it slides right back on. You'll feel the catch when reattaching.)*
4.) Ratchet
Right Arm/Axe: Flip out axe, don't open. You'll see that it takes on the shape of a gun, with a hammer (cocking mechanism) even!
http://i123.photobucket.com/albums/o293 ... hetGun.jpg
Roof rack: Flip the rack upside down and carefully wedge the "claw" in between the shoulders and let the "claw" rest there. The peg will fit in the hole on his back and hold firmly. (This will match the movie model)
http://i123.photobucket.com/albums/o293 ... atchet.jpg
Anyone else?