Maybe I Think Too Highly Of Critics

I took Anthony Lane to task for not recognizing Tom Cruise in Tropic Thunder. But now I see this in Roger Ebert's "Answer Man" column:

Q. I saw "Tropic Thunder" tonight, and read your review afterward. I was curious when you said it was "much enhanced by several cameo roles, the best of which I will not even mention. You'll know the one, although you may have to wait for the credits to figure it out." I didn't stay for the credits, and don't know which cameo you are speaking of.
Paul Gowan, Chico, Calif.

A. Spoiler alert! Maybe I was simply dense, but I, for one, did not recognize Tom Cruise.