On page 162, it says…
Consider the parse tree on the left for input [1^2] in the following diagram:
…and on the left is the “Good syntax” tree, but the data in the root node of the tree is “[i^2]” instead of “[1^2]”. The relevant leaf node in the tree contains “1” instead of “i”, which is consistent with the line I quoted above instead of the data in the root node of the tree.