John Locke is shown in his bathroom carrying the business card Jack gave him. From the angle that shows him holding the card, you can see a different, yellow-ish logo on the left and the name and title on the right with no red banner on top. The real card Jack gave him is shown in the close-up with the red banner on top and his name and title centered on the card.
(33:00) After the ladder breaks free and Sawyer reaches for Locke, he grabs the next ladder twice.