In season 6 episode "A Woman's Right to Shoes", Harry meets Charlotte with a cocktail. When we see him from behind, his newspaper is under his right arm, but when the shot switches to the front, it is under his left.
Miranda warns Robert about going near her baby because the baby has chicken pox. Robert tells her not to worry because he had chicken pox himself when he was a child. However, you can still get chicken pox even if you've had it before. Robert is a doctor and should know that.