One example is the abandonment of the salutary neglect. Before the war, the colonies didn't have to mind about British laws much when it came to trade and taxing. After the war there was a huge war debt that had to be paid and this strained the relations because the British started enforcing their laws which were previously ignored.
Another was that the colonies were sick of participating in British wars. The colonies had many deals with the French and had no quarrels with them. After the war, the relations between Colonies and France were strained because the colonies had to participate in the war and they didn't want to fight wars because of Britain anymore.