I miss the $1 and $2 bills that were replaced by the loonie and townie coins since I've actually incurred physical damage from carrying pounds of coinage in my shoulder bag. Now that I take a second look they were also pretty awesome from a design perspective.
The $50 bill with an image of the dome formation of the RCMP Musical Ride on the back is my favourite:
More about Canadian 70s money here
Aside: I once woke up laughing from a dream that I was a country and western singer whose claim to fame was a song titled "Take the Queen Off Of Our Money and Put On Stompin' Tom." I'm a big fan of money. The monarchy not so much.