There are a few more differences between the American game and the one they play in Canada.
Here are few:
Endzones are 20 yards
- 12 players per team. The extra player is usually called the Slotback
- Players can run pre-snap
- No Fair Catch
- Those one points that you often see/hear are called Rouges or Singles - They happen if a team misses a fieldgoal and the receiving team can't take it out of the endzone. Same if a punt goes into the endzone and it can't be taken out.
There a few more differences but these are the major ones.