Shawn mentions "Numbers" when he is writing on a glass board like Charlie does at the FBI.
Shooting on location discussed.
Subject of a $16,000 question
Marco mentions the show.
Included in a $12,500 question
Subject of a $2,000 question
Subject of a $12,500 question presented by Rob Morrow
A character is shown DVR'ing an episode of this show.
Mentioned by Rob Morrow as he presents a $7,500 question
Title on-screen when David Krumholtz is shown