Having played more than my share of late-fall football in SK, I knew that they were going to have problems with footing during pass plays, generally favoring the defender. Basically what happens is recievers must adjust routes so that cuts are gentler and kind of "straightened out"; both teams attempted to run their standard routes and failed to get much passing yards.
Of course, for the same reasons, a completed pass can be dangerous; once the reciever does get moving downfield the advantage passes to the chased rather than the chaser.
Montreal was able to capitalize by breaking a few and scoring; I personally can't remember anybody else ever winning a CFL playoff game with only 7 first downs. Naturally, no die-hard 'Rider fan could ever cheer for Edmonton, under any circumstances, so all of Saskatoon was happy with Montreal's victory.
Did anyone else find it ironic that the NFL game in Denver (vs Indy) a few hours later had worse weather?
Finally, after hearing the phrase "frozen tundra of Lambeau Field" [Green Bay Packers] once too many times on ESPN/TSN NFL coverage, I feel compelled to add that Lambeau has very comfortable football turf: the field is built on top of a hot-water heating system that keeps onfield temps to 60 F year round (cooling in hot weather, heating in cold). I've been there, we watched a game in our T-shirts on December 13 1999 when outside air temps were well below freezing. It wasn't the least bit cold.