It would also kind of explain the forest green colors Neal is always wearing.
Speaking of green, I just rewatched Manhattan and noticed a few bright green items in his apartment. The hallway outside and his window sill are painted green. His TV is, like, Kermit green and stands out like a beacon in the middle of the apartment. The beads on the dreamcatcher are green. At one point there’s a shelf behind Neal, and it’s all lit up in green. There’s a bright green packet of chips, (I think) on the coffee table, and a little footstool thingo that has a green top on it in that same shot too. And there’s a green plant out on the fire escape. Obviously green isn’t the only colour in there, but once I’d noticed the TV, which was very prominent, it drew my attention to all the green.