Calgary Open Data indicates that there is an amenity=toilet facility here (the existing building in OSM?). It is hard to see the building from aerial imagery, and the building outlines don't match. Does such a toilet exist? Is it the existing building in OSM or a different building?

"Cafe C'est si bon" is approx here. I was a patron last week, but didn't have time to check if it was on the map. A local may have to survey to see if it is a "new" waypoint for OpenStreetMap, or if an existing business waypoint has closed and changed names.
https://www.cafecestsibon.com

Unable to answer "Do you have to pay to park here?" – Parking Lot – osm.org/way/603565320 via StreetComplete 61.1:

A National Park Pass is required, but no other payment required

Calgary Open Data indicates that there is an amenity=toilet facility on the back side of the building already mapped here. It is hard to see from aerial imagery. Does such a toilet exist?

Calgary Open Data indicates that there is an amenity=toilet facility here (a third building between the two already-mapped on OSM). It is hard to see from aerial imagery. Does such a toilet exist?

Calgary Open Data indicates that there is an amenity=toilet facility. Given the size, it is likely a portable toilet. It is hard to see from aerial imagery. Does such a toilet exist?

Calgary Open Data indicates that there is an amenity=toilet facility here. It is hard to see from aerial imagery. Does such a toilet exist?

Unable to answer "How is this power line attached?" – High-Voltage Tower – osm.org/node/2753082209 via StreetComplete 61.0:

Insulator is mounted horizontally, but the line itself is on a vertical mount (supported from above)

Attached photo(s):
https://streetcomplete.app/p/279697.jpg

Unable to answer "What are the opening hours here?" – Matsuya Japanese House (Restaurant) – osm.org/node/196745542 via StreetComplete 60.3:

Matsuya is still written on the door, but it appears to be no longer in business.