Goofs

Its supposedly summer, but after Shawn and Gus chase Pierre down the slopes you can see their breath and Juliet has on a winter jacket when arriving to Canada.

However, in the world of Psych, Canada is wintry during summer (although it is summery there also). Earlier scenes establish Shawn and Gus went to Canada specifically for the snow vacation. Or a goof can be added that there is snow at all, never mind enough for skiing.

The post-climatic scene where Shawn & Juliet are on the expansive Bridge, far view has them leaning on the bridge. However, close-up has them talking to each other.

Two cut-away shots show two people on the long bridge leaning over, looking off the bridge. After one, viewers see Shawn & Juliet facing each other facing the path of the bridge, talking. Again, a long view shot, two people are leaning looking off the bridge.

Viewers are left wondering where the two characters are -- even if they are the only two on the bridge at all.

Again, far away, they are beside each other, looking off the bridge. Close up, they are facing each other, not looking off the bridge.

During the early ski chase, the camera crew can be seen reflected in Shawn's visor / goggles numerous times.

Shawn remembers seeing Pierre Despereaux on Lassiter's wall of suspects when they snuck into his house in "Lassie Did a Bad, Bad Thing", but in the episode when they were there, there were only 4 names on his wall: A character from the episode and the names and photos of three crew members.

Shawn says he saw Pierre Despereaux on Lassiter's wall of suspects when they searched his apartment, but they searched a house.

When Corporal Mackintosh tells Shawn and Gus that he was fired he mentioned that it was because he disabled the alarm system at the Museum. However, the actual place the alarm system was disabled was a Gallery and not a museum.