Near the beginning the Season Six episode "Dewey's Opera", Malcolm and Reese are launching push pins into ping pong paddles. When Reese picks up a new push pin it is yellow. When it hits Malcolm's board, it is white.
The luging scenes are inconsistently overcast or sunlit.
Dewey hears the "return the bed" conversation & writes his "no one else knows" song. Then we see Jamie looking through the window at the neighbours' child. From the inside, Jamie's chin is level with the bottom of the window pane. Viewed from outside, his eyes are level with the bottom of the window pane.