The rendering controls (Figure 16) can be very important to professionally printed documents. All of these should be selected as at least warnings. Transparency may or may not be a problem, depending on how the print service handles PDF files; you’ll need to ask. Halftone screens and transfer curves are printer-specific and therefore should be set by the print shop, not specified by the PDF file. Lines that are too think can disappear when printed, so set a threshold of about 0.2 points to make sure all your line art prints.
Figure 16 There’s not much I care about in the Rendering pane. For professionally printed documents, you should flag pretty much everything here as an error. (A good minimum line thickness is 0.2 points.)
In this modern era, it’s unusual for a PDF file to contain embedded PostScript code. I gave this control “Warning” status just so I can find out the source of the code and, preferably, what it’s trying to do.