The boy from the photo booth is Aaron Smolinski..and yes that was him. I had the great pleasure of visiting his parents home (the mom by the photo booth was his real mom and his father was one of the guys by the car filling with water). That interview he gives was on the ramp to the Highwood Museum in High River which recently suffered a fire, but will be restored. The shops Gus and Lana Lang walk by are right across the street from that location..as is the "town square" which was just a parking lot next to a back alley.
I live in High River which was Smallville for Superman III and see Lana Lang's house almost every day. It's up for rent now but the renter didn't reply to my request for an inside tour.
The only location I haven't found or visited is the chemical plant. The bridge sequence was filmed at the bridge just south of Longview, Alberta, and the picnic scene was filmed near Blackie, Alberta. They put in the culvert under the road for Superman to change back to Clark in. It is still there.
The bridge you see in Calgary at 10:33 in the first video was featured in Exit Wounds with Steven Segal (yuk).