Color composites are even better. Many color graphics files are displayed on the computer screen in black and white. If you don't label the elements as color, we will never know that they should print in color. Failure to include all fonts with your disk. Even if we happen to have a font with the same name as the ones you use, it is possible that they were designed by different companies and are not identical.
Any differences can cause type to re-flow, lines to be cut off, hyphenation to change, etc.
If you supply files using fonts we don't have, your job will be delayed until you can supply us a copy of the font or you authorize us to substitute a similar font that we do have. It is sometimes obvious how a piece should be folded and or backed. However, quite frequently it is not. Without a dummy, we may have to contact you for clarification. If we cannot reach you, your job may be delayed.