Make your video's broadcast safe

Always color correct to broadcast safe. The use of a standard Broadcast Safe filter on everything works, but is a bit like using a sledgehammer to give a haircut. Instead tweak the luminance and saturation yourself.

Luminance
Don’t exceed 100 IRE on whites or dip below 0 on blacks.
Saturation
Color saturation should be within spec on everything. Read more about this in this tutorial on the video scopes in Final Cut Pro.

Graphics
Graphics are not designed for tv and put you out of spec quickly. Make sure a graphic’s colors are broadcast safe. Desaturation works fine, (even if you limit it just to one offending color).

White Text
White text as determined by Apple’s color picker, is 100% white. Add a glow and and you’re out of spec. Make it a practice to color white text 95-98% white on the grayscale slider so you're not crammed up against top limit.
This is barely visible on a computer screen and unnoticeable on TV. Flicker Flickering graphics and text is a product of the interlaced nature of television. With any graphics, go through the aforementioned steps, making sure color is in spec, and then make sure all of these elements are sitting on even, whole coordinates. What does this mean? On the Motion tab in Final Cut Pro, under Basic Motion, make sure the Center measurement’s X & Y coordinates are whole numbers (no decimal point after them) and even numbers. Use Paste Attributes / Basic Motion on subsequent copies of this element down the timeline to change them all quickly.
Add drop shadow to text to reduce flicker.
NB: Using uncompressed video makes you more versatile when editing titles.

Title Safe Make sure all of your critical graphics & text are within the title safe boundaries. View helpful markers in Final Cut Pro by choosing View / Show Overlays and then View / Show Title Safe. HD / widescreen content can eat up a lot of the horizontal space when shown on a standard 4:3 TV, so move those titles into the center!