Forum:5 things to look for: Red and Yellow

I was watching Amy's Choice and realised the theme of red and yellow is very prominent in this episode. The roundabout in the park is red, as is the campervan, the Dream Lord's racing attire, the postman's bike (obviously). There's also a lot of yellow, the American style school bus for instance, the kid's backpacks, the Doctor's poncho (Rory's is red). Not to mention the ball the doctor throws through the Dream Lord is red and yellow. Also if you watch the preview for the next episode the forklift in the background is red and yellow, the uniforms are red and another character is dressed in yellow. This can't just be coincidence.