If a customer was engaged in conversation with the salesperson, I certainly would not interrupt. But if I felt that the person's questions weren't adequately answered, I wouldn't hesitate to gently offer my assistance after the salesperson left -- if the customer seemed open to that.
It's important to pay attention to body language and whether the person is lingering at the display, trying to make their decision. You can usually tell right off if someone feels that you're interfering or if they welcome your help.
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