In a bit titled One Minute Drills, the latest behind-the-scenes feature from the Half-Blood Prince DVD (when does it come out in my country? December 8th? *dies*) Tom and the gang are asked to describe their characters storyline from the first film through the 6th. Watch Tom describe Draco’s jealousy and childishness starting at the 4:28 mark.
Thanks Feltbeats Junior Admin Estrella89san for the tip!