At about 16:15 James gets into the truck to go to the store and he is wearing a yellow shirt. When he arrives at the store he is wearing a red shirt.
In the credits, one of the pieces of music Michael Grant plays on the piano is listed as "Nocturne in Eb minor, Op. 9, No. 1," by Frederick Chopin. However, Chopin's Nocturne Op. 9, No. 1 is written in Bb minor, not Eb.
When James throws the box of pictures into the trash, a smooth side of the box is facing up. Later in the film, the side with the round hole is facing up.