Working Long Hours
Americans are used to the 40+ hour work week and don't expect much vacation time in return. In other countries, work hours are pretty flexible, and vacation time and mental health days are given out often rather than stressed over. Overworking yourself is seen as unnecessary and unhealthy.
Misusing the Word "Football"
Europeans got this one right. Why is American soccer not called "football" as it is in other countries? In soccer, you kick the ball with your foot. In American football, you do no such thing. The discrepancy is confusing.