Loose sheets in a program, e.g.

INSERTS

Think of the extra pages you might find tucked inside a magazine or DVD case, often with ads or bonus content.

This clue refers to the extra pages sometimes tucked into a printed program, like those at concerts or events. "Loose sheets" hints at something added separately, and "in a program" points to their placement. The word "inserts" fits perfectly—it literally means items inserted into something else, like ads or notes slipped between pages. The "e.g." signals this is just one example of what inserts can be.