Jack Lord trivia:   

The reason Jack Lord was never cast again as Felix Leiter was that the Powers That Be in the Bond films felt that Lord had a strong enough personality and screen presence that they were afraid he might possibly "upstage" Sean Connery. That might be debatable, but Jack Lord did have a real "presence" when he was on-screen in "Dr. No."

Items from Wikipedia:

Jack Lord was considered for the role of Captain Kirk on "Star Trek;" the role ultimately went to William Shatner. Because Lord wanted to co-produce and have a percentage in ownership of the series, he was ultimately rejected by both Gene Roddenberry and Desilu Studios.

Game show host Richard Dawson made fun of Jack Lord on the first episode of "Family Feud" when it debuted in 1976. His first line was "I haven't been this excited since I got the oil drilling rights to Jack Lord's hair!"

Originally, he wanted to be billed "Jack Ryan" (Ryan was his real last name), but another actor had already registered that name with Actor's Equity. He wanted a short name that would fit on a movie marquee, so he became "Jack Lord" instead. [Interesting choice in the light of the next item -- DF]

Dubbed "the Lord" (behind his back) by the cast and crew of "Hawaii Five-O" because of his imperious manner.

Don Firth