When Shawn and Juliet are on the deck, the Canadian flag flying over the crowd has only one red field, on the left.
When Shawn is talking to Buzz about his feelings for Juliet, Buzz is writing down what Shawn is saying with it addressed to Chief Vick, strongly implying that Buzz is secretly in love with Vick and is considering telling her about it. Not only would that be highly inappropriate and out of character for Buzz because of Vick being his married boss, but Buzz was also engaged to be married in the pilot episode, and it's clear the wedding happened and that he's still with his wife because he's still wearing his wedding ring.
When Shawn hits Valeria over the head with a stick, he makes contact and pulls away before the sound is heard.
The souvenir shop Shawn and Juliet visit is supposed to be in Vancouver, BC, but the flag of Alberta is seen outside the building.