This episode was filmed at Black Creek Pioneer Village and Schomberg, ON.
The coordinates 79.290N, 43.581W, which is 79°17'24.0"N 43°34'51.6"W, end up in the middle of Greenland.
"Deader than a Texas salad bar" is an homage to Lt. Colonel Cameron Mitchell in Stargate SG1 (s1e16).
The hands of the clock on the map indicate 9 o'clock, but later on Shade and Everett say it was 3 o'clock.