Due to the convoluted nature of the storyline, which jumped back and forth between the 1850s to the 1970s, CBC published a family tree of the characters in the miniseries, so viewers could follow the story.
The miniseries was originally planned to extend beyond 13 episodes, but production was curtailed by a CBC technicians' strike that year.
Despite this being a CBC production, the original run of the mini-series was blacked out on CKLW-TV in Windsor, Ontario (then partially owned by the CBC), as the CBC originally planned to sell the series to an American network or syndicator. Such a sale did not materialize.
The miniseries was rebroadcast in 1974, but was re-edited with extra footage added and some scenes (especially those taking place in the modern day) cut.
Sources
TV North: Everything You Ever Wanted to Know About Canadian Television, by Peter Kenter and Martin Levin