Bright, saturated colors bleed on TV, so you need to desaturate them. Create an adjustment layer over the whole comp, then apply the broadcast colors effect to that layer, set to “key out unsafe”. Make sure your comp’s background color is something like bright green. Now all “unsafe” colors will be keyed out and appear bright green. To make them safe, either choose a different, less saturated color (if you can, say, to text) or apply the hue/sat effect to the adjustment layer, making sure it’s above the broadcast colors effect in the effect stack. This will desaturate everything — as you desaturate, watch the green go away. By the way, for yellow, try changing it to a slightly more orange color if you can.
As for the flicker, if you have video with thin lines in it, try applying a .5 to 1-pixel vertical blur (fast, gaussian or directional blur) to the video. If the fine lines are graphics scaling up or down, it might be best to apply the blur to an adjustment layer over the fine-line graphics.
Hope that helps,
Steve