I just completed this build, and the only surprise for me was the pinion gear. Body, wheels, ESC, motor, servo, pinion gear, servo arm, aluminum shock caps (wish I'd have gotten the metal shock piston blanks as well, getting the plastic ones smooth enough to move freely was a pain in the neck), radio system, and batteries.
I'd say get a bottle of the orange (3x strength) threadlock for the set screws on the indrives, I've had mine come loose twice with normal threadlock and I have orange threadlock drying on mine as we speak, hopefully it'll hold better.
I also found the body mount system to be a frustration, particularly with the Raptor body where the rear body mounts are on a kind of corrugated surface that reduces the available space to get the clips in. I've ordered the Pro-Line body mount thumb-washer kit, with the plan to just drill holes in the stock body mount towers and put the mounting screws in:
https://www.towerhobbies.com/cgi-bi...bEyTUbdcW8E7GeS2kgsCplnc44t5Xm_kaAnftEALw_wcB
This was a fun build, now I'm looking for an excuse to do another :-D