Some claim it is a mistake that Matthew attributes the quotation in Matthew 27:9-10 to Jeremiah instead of Zechariah.
Most questions of this sort usually find answers in the footnotes of the common Study Bibles.
For example the NIV Study Bible has this footnote on Mt. 27:9
This is actually pretty common in the Bible. The NIV Quest Study Bible adds possible another thought:
If a more in depth discussion is needed, I would recommend the valuable book Hard Sayings of the Bible, which discusses this passage on pages 399-400. Another contemporary reply, is Gleason Archer's Encyclopedia of Bible Difficulties (Zondervan, 1982), p. 345. However, some might prefer the older approach used by E. W. Bullinger in The Companion Bible (ca. 1916; reprinted in the U.S. by Zondervan, 1974), at Appendix 161, which deals with these passages at length. "When Critics Ask" by Norman Geisler and Thomas Howe also has a short discussion on it.
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