The picture on the wall is Dave Polgar's head shot from his audition. Brian Flinchbaugh and Bill Shannon hung it as a surprise when he showed up to film the pilot. They left it up for the first two episodes before replacing it.
The pilot was actually filmed twice. The role of Alyssa Jackson was re-cast after the original pilot was complete, so the producers decided to re-shoot with Alyssa Clancy permanently in the role.
The opening scene with Jake and Aiden at Romarco's was the only footage from the original pilot to be included in the released version without being re-shot.