I've heard a U.S. person call another person aggressive as a compliment. In Canada, it's an insult. Also, there are fewer individual rights and more group rights. It's obviously more socialist than the States. Government hospitals, universities and schools. Private schools are rare. Even the Conservative Party supports abortion, same-sex marriage, and universal health care. People are more reserved and more polite.There's a common joke about holding the door open for the next person and saying sorry for everything. We are not as fanatical about sports. We are not really patriotic (unless we are travelling or someone mistakes us for a United Statesian). We are a bit insecure, having lived beside a powerful and dominant country all our lives. People from the U.S. who have moved here have told me there's an absence of a pervasive, background fear that they didn't realize was there until they moved to Canada.

Seconded, the differences from the U.S. seemed kinda subtle most of the time (but same issue, what I noticed as a tourist kinda thing).