Error in filmography
Jack was NOT in "Serendipidy" (2001).
I'm really surprised this error exists in the entry for such a major star, in a fairly recent production.
Someone has confused Buck Henry for Jack, and he does look somewhat like him in this role.
The process for correcting IMDB is a bit beyond me, but I will also post this on the Serendipity page and hope that it gets fixed.