Continuity mistake: In the scene when Richard Gere is trying out the video camera before he and Diane Lane begin to fool around, the camera box disappears and reappears on the bed.
Other mistake: When the son is going to the potty, you hear him peeing but there is no stream of urine.
Continuity mistake: At the start Ed has a blue shirt on. He leaves the house with his son - when he turns to wave goodbye the shirt has turned grey.
Answer: There is no significance, the script just says it is a "little doodle".
Sierra1 ★