Ron's trailer starts out with British Columbia license plates but when they arrive in "Seattle" it's suddenly a Washington plate. Considering that Ron said he was driving all the way up to Nelson (which is in British Columbia), it seems highly unlikely he would switch license plates in between.
When Ben is placing up the skateboard posters he is wearing jeans, in the next scene he jumps over some crates now wearing shorts, when he returns to Jack in the swimming pool he is wearing jeans again.
When Ben goes back to Ollies after posting the "missing" posters, he walks past a Telus phone booth. Telus is the dominant phone company in western Canada and covers Vancouver, where this movie was filmed.