Corrected entry: In the US version, page 485, Slughorn tells Harry that he has "a house-elf taste every bottle after what happened to your poor friend Rupert". Slughorn should have said "poor friend Ron", not Rupert. One assumes this is a reference to Rupert Grint, who plays the character Ron in the movies.
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Correction: If you notice, Slughorn calls Ron a different name earlier in the book as well, so this is not J. K. Rowling's mistake, but a character mistake, highlighting Slughorn's lack of care for Ron. But the assumption (that it is a reference to Rupert Grint) is plausible.