- Morrow and his wife show an affinity for "pun" names. Her name, Debbon Ayer, is a homophone for the word debonair, which means "suave" and "snazzy" or "carefree." Their daughter's name, when spoken without her middle name, is a homophone for the word tomorrow.
- On September 21 of every year, Rob and his wife Debbon Ayer celebrate their "Birth-a-versary". It is the date of both of their birthdays and their anniversary.
- He has a production company named Bits and Pieces Pictures Co., which has produced films, including Maze (2000).
- Was an extra as a jury member in court in a Saturday Night Live (1975) skit with Rodney Dangerfield as host.
- Rob and his wife Debbon welcomed their first child, daughter Tu Simone Morrow. The baby weighed 7 lb 3 oz. (April 25, 2001)
- He is an avid skier, and he skies regularly with his close friend Fisher Stevens.
- He is of Russian Jewish descent.
- Son of Murray Morrow, an industrial lighting manufacturer, and Diane Morrow, a dental hygienist. Rob's parents divorced when he was 9.
- He was cast as Douglas in The Island of Dr Moreau (1996) but dropped out just before filming and was replaced by David Thewlis.
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