Grover changes from blue to yellow on Stewie's phone.
In the scene before Lois uses diet pills, her eye make-up disappears but returns in the scene after.
When Lois' agent arrives at the door after Lois looks through the peep hole and opens the door there is no peep hole visible on the door and later in the scene the door has disappeared completely.
In the final scene where Stewie talks to Brian in the "office", Brian is seen wearing his regular red collar when seen from behind, but when seen from the side, Brian is wearing a white shirt collar and tie.
Brian takes off his collar during the boat race, but he is wearing it on the newspaper photo shoot.