First blogpost, nice! This is before I rewatch the movies, so all this is entirely speculation.
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One little thing that has been on my mind for a while, especially since I'm pretty sure this detail bothers others as well, is human objects present in the Cars universe. 
Most of the human objects we've seen in Cars2, such as cups/glasses and instruments (seen below), are used by "Alza" forklifts.

However, Alza forklifts seem to have two separate "forks" (or "tynes") that are able to move individually and bend/twist like human arms (they're even capable of folding their "arms"), while most other "pitties," granted can twist their forks and move them left/right individually, have the forks connected by a "carriage," so they are unable to move them up/down individually. While simply holding cups might be possible for pitties, tipping the cup to drink from it would be absurdly difficult, resorting to asking for a straw. Needless to say, playing instruments is downright impossible.
But at least forklifts are able to grab and pick up objects. What about the usual four-wheeled cars? This miniscule detail is what started this whole blog.
By rewatching the movies, I want to try and make headcanons for the cars and possibly redesign human objects to be functional/usable for them. No more confusion and car torment!