Just noticed that the paint sliders and their values are criss-crossed:
Couple other issues: some bodies have inversed morphing values, like the Range Rover. All the morphs toward the back stretch in the wrong directions than they should.
Something that isn't so much a bug, but a concern, is about the paint options for cars. Will two-tone be added to at least some of the existing bodies? Some bodies also seem to have strangely assigned values, such as only the front bumper being recolourable. Overall, the main concern I have with the paint is regarding the window trim. Modern cars have the black outline to their fixed windows where they're glued and currently that's recolourable in the same way as the trim around the windows of older cars. Will this be addressed to be more realistic?
For all I know, most of these are things that were maybe rushed a bit for the UE4 release and set to be fixed later. Anyways, other than that, the UE4 version is really good and is getting better as content gets added.