Made during a busy time for syndicated Canadian TV series' such as "Last Of The Mohicans," "Cannonball," "The Littlest Hobo" (1st series, not the version made in the 1970s) and "B" films "Flaming Frontiers" and "Wolf Dog." I heard from a child extra in "Annie" that Walter Sande was a great practical joker and talented at sleight-of-hand, which entertained cast and crew alike during downtime.
The reason the series was filmed in Canada was that labor and resources were cheaper and marketing possibilities wider. Inexplicably, the bonanza ended by 1960. It took decades for the Canadian film industry to recover, but recover it did, thanks largely to productions like "Tugboat Annie."