The weight for the car issue to me wouldn't be a big deal. Maybe he has been weighed at the doctor's office or at home and the parents have come up with a different higher weight than what you are weighing him at. Either way I would not be worried about 2.5 pounds. I had moved my kids to forward facing or to a booster seat when they were a pound or two away from the recommended weight and felt fine doing so.
Some parents may not worry about the exact weight.
In regards to the clothes - it wouldn't bother me either (like others have said). I am sure he has more than 1 pair of pants but since no one else is there in the morning when he is getting dressed then you don't know if he is begging his mom to put on those overalls because they are his favorite. Kids go through stages where they like one pair of pants or one shirt the most
As long as the child is happy and healthy, the parents are paying and seem to be involved decent parents then it isn't anything I would ever bring up and nitpick personally. I guess it depends how strongly you feel about it though![]()