Last night's season finale of "The Office" trotted out a parade of guest stars from comedian Jim Carrey to Steff from Pretty in Pink. But Deal Journal's gaze was trained on one man: Warren Buffett.

The world's most famous investor, as Deal Journal wrote about previously, showed up to interview for the vacant (fictional) job of Scranton branch manager for the Dunder Mifflin paper company.

Buffett's...