Trivia: The licence plate on Jeanie's car says "TBC". This is an abbreviation for The Breakfast Club, another film that John Hughes wrote and produced.
Trivia: During the Beatles song, Kenny Ortaga (choreographer) came up with more knee dancing. But because Matthew Broderick had knee surgery before, that was cut.
Trivia: When Rooney is at the pizza parlor and he is walking up to the counter, the man that is standing to the right of Rooney (wearing glasses, and looking at the TV) is director John Hughes.
Answer: Cameron stares specifically at the child in the painting, because he identifies with it. He feels the lack of affection and attention from his own family (unlike the child in the painting who is enjoying time with her family, the mother is holding her hand).
Shipper