My Altis 1.6 2016, Front passenger seat vibrates if no one is sitting, it is loose, many other reported this too, it is a very common issue in 11th gen corolla.
Other issue is headlights low beam are of no use, it is very dim, that is usually the reason corolla drivers drives with full beam. I have replaced it with Philips halogen bulb.
Paint quality is not good, no way near to JDM, It is just that very thin layer of paint is applied, no issues in shine or anything else, I think all pkdm has this lacking.