Blum made a cameo appearance as himself in the 1983 Woody Allen film Zelig .
Blum has appeared in various documentaries on PBS such as the American Experience series , including Theodore Roosevelt in 1996 with fellow historian David McCullough .
Blum made a cameo appearance as himself in the 1983 Woody Allen film Zelig , and he has appeared in various documentaries on PBS such as the American Experience series , including Theodore Roosevelt in 1996 with fellow historian David McCullough .