Canadians "Stand at Ease", Americans have "Parade Rest."
Americans use "Canteens", we use "waterbottles".
Americans use "clips", we use "magazines"
Americans wear "shoulder sleeve insignia", we have "shoulder flashes"
Americans wear "dog tags", we wear "Identity discs" (even though they have been the same rectangular pattern (and not discs at all) since 1950 and the Korean War.)
American civvies call it a Hummer - US soldiers call it a HUMV. My friend bought one surplus (and spent a year trying to get it across the border) - they ride more like an MLVW than an Iltis - diesel powered with hard seats and very, very loud!
If a Canadian puts his hands in his pockets while in uniform, he will be yelled at about "American gloves." And if he is chewing gum, he will be asked (not nicely) "Are you an American?" before being ordered to get rid of it.
American fatigues are also called BDUs (for Battle Dress Uniform). The Canadian Army wore Battle Dress also - but stopped in the late 60s and early 70s.
Canadians wear toques - so do Americans, but they have never heard the word "toque" before.
Americans eat MREs (Meal, Ready to Eat), and Canadians eat IMPs.
In Canada, a "Regiment" is an administrative entity in most cases, in the States the term denotes a specific unit equal to a Canadian "Brigade".
A Canadian Regimental Sergeant Major is the top NCM in a unit - in the States the top (enlisted) dog in a battalion is the First Sergeant (or "Top").
In Canada, Warrant Officer grades are a natural progression of the rank structure, in the States they are more like specialist ranks. (Can someone explain them to me?)
Canadian NCOs wear "chevrons" or "hooks", American NCOs wear "stripes" with "rockers".
Canadians wear "Cap Badges" (or "cap brass" as some call it), Americans wear "Hat Badges"
In World War Two, Canadians laughed at Americans for using "unmilitary" terms like "5/4 ton truck" (instead of "15 hundred weight"), "gasoline" (instead of "petrol"), "flashlight" (instead of "torch"), "wrench" (instead of "spanner") etc., but things have come full circle and the Canadian military now uses the same "civvie" terminology the Americans did.
We honour the dead or end the day with "Last Post", Americans do it with "Taps".