After Griff's confession to Jarod at Muffler's Labor day party, we see a fully clothed Griff jump on a completely naked Jarod. In the next scene, we see Griff striping off his clothes, along with Jarod, who is completely dressed again.
In the post-graduation scene, we see Jarod and Griff take off their robes, but when they meet Andy and Nico, Griff suddenly has the yellow cord from his robes around his neck.
The first time we see the boys in the video store, Nico has his collar turned up. For a brief moment when his mother appears, his collar is turned down, and then in the next scene it is turned back up again.