25 minutes in the movie, we see a picture of Adam Goldberg naked with baloons attached to his penis.

We also get a quick view at Adam Goldberg penis when he dressing up.

There is a quick scene with Dermot Mulroney naked and his picture is fading away as he turns to face the camera. So we get a very clear view of his butt, but a faded view of his dick. He seems to have an average size cut dick.