Here's a list of common rattle I was able to pinpoint:
1° The cluster (see picture #1 below).
Simply put your nail between the cluster and the dash. The rattle will go away. To fix this issue, remove the cluster and put 3M 1/8 neoprene under the cluster. It'll be more tight. If the rattle continue, put neoprene at the top of the cluster as well or try 3/8 under it.
2° The radio face plate (see picture #2 below).
The top part of the face plate is very thin and weak. Put your finger on it to stop the rattle. To fix it, remove the face plate and put 3M 1/8 neoprene on the top frame of the SYNC screen.
3° Driver or passager top door mini speaker (see picture #3 below).
Push the speaker with your hand toward the door frame. I have no solution yet as I have not address this issue yet in my car.
4° The driver or passager door against the dash (see picture #4 below).
While the door is close, push the door trim near the dash. The vibration will stop. I don't have yet a fix.
5° The armrest (see picture #5).
The arm rest will rattle when going over imperfect road or anything that make the car shake. To fix, put 3M 1/8 or 3/8 depending on what will make the cover tight against the bin when closed. Make sure it's not too tight.
6° The "door speaker" ratle when listening to music (see picture #6)
Put your hand on the trim that is on the speaker. Remove the door trim and put neoprone on the inside trim of the door.
7° Rear seatbelts (no picture)
Make sure the metal clip is not resting on the plastic trim at the top near the window but at the bottom against the seat itself.
8° Hatchback cover (no picture)
Sometime, it is possible your cover is not set properly. Make sure it is.
9° Windshield is cracking during cold temperature when the car is cold (-5°C and less)
It's normal and there's nothing you can do. The windshield is set to a bit smaller then the area where it is (1/8 or 1/16 to be accurate (don't remember!!)). This allow for expension of the material when cold or hot.
10° If none of the above is your rattle inside your cabin, try moving the passenger seat a bit forward or backward. It's not 100% locked and the metal clip is shaking a little bit.
Yes, I have experienced all of the above. It take time to find the rattle.
NOTE: If you see 1/8 is too tight, don't put 1/8. Put less. Don't put too much stress on the material as it'll be too tight and will start to rattle again in the future. You want it tight but not too much as the material will expand or crack (remember, it's cheap plastic). If 1/8 doesn't solve it and it's very tight, don't try more. The problem is somewhere else arround that area.
I also suggest that you do the above work when the temperature is near 15°C-20°C. Above or below this, the material is not in his "default" form and might be contracted or expanded because of the temperature.