I'm not sure what you meant by the quote talking about the right to display the copy - again, a material object - publicly. A used book store or record store is allowed to show the book or record for sale. It's not allowed to, say, play the record for a party - that's the performance right - or make a movie out of the book. It's allowed to display the physical object.
It's not totally clear to me that those are different. For example, if you have a painting or some other flat, static creative work, then public "display" and "performance" are the same. You don't need a positive law to say you can show people a DVD box. Additionally, some works are unique or at least not commodities like a Shrek DVD, in this case how can you let the buyer know what they're buying without letting them watch the DVD or open the book?
