Greg Cox wrote:
As I recall, there's also a brief color sequence near the end of Portrait of Jennie--during the climatic storm scene.
Early color was not that different from early 3D* in that respect. Witness the inexplicable use of 3D in one reel of Harry Potter and the Half-Blood Prince
and a couple of scenes in Francis Ford Coppola's Twixt
*Early, of course, in the latest cycle of 3D movies. Of course, it also took a few technical innovations before color was widely adopted.