When Jerry says Kramer takes good pictures he's leaning back in his chair with a pencil near his face. The next shot he's sitting forward in the chair with his elbows on the table.
In the scene in Calvin Klein's office, we can see a vertical seam between the back and side of the box containing the city skyline backdrop outside the office window.
In one scene, Kramer is modeling for Calvin Klein and trips and falls against the wall. On the wall, you can see a makeup smear from when Kramer fell.
Jerry and Newman don't say their "Hello"s like they normally do.