Psalm 72 ends with the words:
The prayers of David the son of Jesse are ended.
Yet after this a number of Psalms, especially many of the Psalms of Ascent are attributed to David (I think eighteen in all). Perhaps more strangely, Psalm 72 itself is marked as "Of Solomon", so it would seem an unusual place to mark the end of the psalms of David.
What is this line referring to? Is this merely evidence of a later scribe messing up the overall compilation of the Psalms? (It would still seem strange that the line would end up after a psalm of Solomon.) Are there other proposed explanations?