When "Sam" is investigating his old computer looking for clues to his forgotten life, he enters the "Sent" folder in his email program. While there is one email sent by him to his former girlfriend, "nicole72", subject: "I know you're mad", the rest of the emails *sent* by him are mostly spam, including an email that Sam would have sent to a Randel2012 at 3:28am with the subject, "100 mg 60 pills $2.17 per pill".
When the red bus goes by, the camera crew is reflected in its side.
When they are seated at a table Jamie Kennedy unpacks some takeout and unintentionally sends an item (possibly a utensil) airborne which causes Jennifer Love Hewitt to cover her mouth in order to suppress a laugh and continue with the scene.
When Sam is reading the email he sent to Nicole, the email is visible on the screen. Though the email says 'I bought the ring,' Sam reads, 'I bought you the ring.'