Im glad you brought this up! The rear passenger door has started to creek and strain when i opened and closed it then when on new years day when dropping off my friends at 3am my buddy got out then couldn't close it. I insisted that there was nothing wrong with the car but that he was drunk! Well he was drunk but the door did stick open. After finally closing it, the next day i looked at the door but couldn't find anything wrong. Since then it has become slightly easier to open/close with some grease, but not much. So its called a door retaining clip, and i can replace it myself? Cool.