One interesting POD could be the choice of a different route for the western end of the CPR.
In OTL the CPR eventually opted to take Rogers Pass over the Rockies rather than the more northerly Yellowhead Pass. There was some thought of using the Crowsnest pass to the south but that was seen as being too close to the US border for comfort. The CPR would, in the late 19th/ early 20th century opt to build a line through the Crowsnest pass to take advantage of the rich mineral wealth in South Eastern BC and eventually establish a parallel railway line through southern BC.
One POD could be a more successful survey of the route through Southern BC. This likely means that Lethbridge grows at the expense of Calgary, and that towns like Cranbrook, Fernie, Castlegar, and Osoyoos grow at the expense of Kamloops, Revelstoke, and Kelowna. It also probably leads to a faster development of British Columbia as well.
An earlier POD could also be found in the decision to construct the city of New Westminster. The considerable cost of the venture hamstrung the Colony of British Columbia for it's entire existence and nearly aborted the project. Had it not been undertaken, the forgotten town of Derby outside of Fort Langley would likely have grown instead, perhaps becoming the Colonial capital.