Audio problem: In "Provenance" in Season 1, when Sarah goes to touch Evelyn's shoulder, you hear Sam's voice telling her to stop, except his mouth isn't moving at the time the phrase is being uttered.

Revealing: In season 1 episode 15, Officer Kathleen looks for Sam's data in her database. The record id is DF-23094. She then follows the link to Dean's record. Its record id is also DF-23094. A database cannot have two records with the same id.