When Shawn bumps into Juliet at the police station, he says "sorry" but in the recap when he's explaining how the police found them, the flashback shows Shawn saying, "Oh, sorry, Jules."
The red line on the map tracing the group's route through Santa Barbara (looking for the site of the bell tower) makes all right turns, but their first turn is a left.
When Sean sets the map on the painting, we see the lighthouse on the uniform. But he then moves the map to the right thus covering the uniform - yet when we see the closeup again, the map has moved back.
When Juliet, Shawn and Gus are in the interrogation room, Juliet says the French word "couleur" means "paint" in English, whereas it actually means "color".
After Henry hands Jack his drink you can hear a sipping sound even though he hasn't lifted it up to lips yet.