- He was the voice and drama coach of Chuck Norris. He "taught him how to speak", by putting his fingers in Norris's mouth, and stretching the mouth wide open. Chuck names him as the only man in the world who could get away with doing that to him... a fact of which he was always proud.
- Would often sit up at night thinking of ways to insult the robot ("Be quiet, you bubble-headed booby!") while on Lost in Space (1965). His colorful put-downs for his mechanical colleague, almost all of them unscripted, are among the best-remembered aspects of the series.
- Until his death, he received 500 letters each month. Having been grateful for the character he played on Lost in Space (1965), he answered each and every letter.
- Had beat out both actors, Jack Elam and Carroll O'Connor for the role of Dr. Zachary Smith on Lost in Space (1965).
- He holds the world record for a guest-starring role in a single series, having been in most of the episodes of Lost in Space (1965) except the original pilot.
- Often brought a large bag of tootsie-roll pops to work for the cast and crew.
- Jonathan Harris passed away only three days before he would have had his 88th birthday. That same day, his family and friends attended his funeral.
- Before co-starring with Gilbert Roland and Dina Merrill in a movie that was never released, he almost died, while traveling to Cuba. At that time, Fidel Castro was on the verge of staging the coup. His crew were bombed at the airport. By the time filming was completed, Castro was in power as the new dictator, therefore the film was seized.
- Came up with a list of alliterative insults that eventually worked their way into popular speech on Lost in Space (1965).
- Harris passed away from a blood clot in his heart while receiving therapy at an Encino-area hospital for a chronic back problem.
- Was physically healthy and physically active until his death at age 87.
- Swapped his New York City accent for a more sophisticated baritone voice, after he watched B-movies.
- Received a degree in pharmacology from Fordham University.
- Was invited by Redd Foxx's to attend Foxx's open house party, where Harris was the only white man at the party.
- Survived by his wife of 64 years, Gertrude Bregman, and one son, Richard Harris (born 1942).
- Harris was originally supposed to do five episodes of Lost in Space (1965), but proved to be so popular, he stayed on, until the series' cancellation.
- Before he was an actor, he worked at many drugstores in New York City.
- Met Guy Williams on the set of Zorro (1957), years before he co-starred with him on Lost in Space (1965).
- He never retired from acting until his death.
- Although he reprised his most famous role as Dr. Smith in the television special Lost in Space Forever (1998), he refused a cameo in the motion picture version of Lost in Space (1998) later that year, unlike June Lockhart, Mark Goddard, Marta Kristen and Angela Cartwright, the other stars of the 1960s series. With typically cryptic Dr. Smith flair, he announced that if he could not play his own role in the movie, he wanted nothing to do with it. Interestingly, Gary Oldman portrayed Dr. Smith in a curiously subdued fashion.
- On Lost in Space (1965), his character was the adversary sidekick of Guy Williams' character. In real-life, he didn't get along with Williams during production.
- His only son, Richard Harris, who was 16 at the time, visited the set of The Third Man (1959), where the relationship between father and son was reconnected.
- Began his television series Lost in Space (1965) at age 50.
- He was the only cast member of Lost in Space (1965) who would not appear at fan-related conventions without being paid. His asking price was $500.
- Despite his interest in the performing arts, he could not afford any money for tickets. Therefore, he became an expert at sneaking into shows he wanted to see.
- Was very close friends and mentor to writer/producer/director William Winckler. The two often had three hour luncheons twice a month for many years.
- While attending James Monroe High School, he didn't fit in well with his peers, with the exception of his future wife, Gertrude Bregman, who was his best friend.
- Before entering the show business, he watched lots of English movies to adopt the ways of a classical British actor.
- Following Lost in Space (1965), he did numerous commercials for the International House of Pancakes.
- Although his character's eventual monopolization of Lost in Space (1965) aggravated members of the cast, all of them stated that he was the nicest of people to work with.
- Harris and the rest of the cast of Lost in Space (1965), were very disappointed by its cancellation in 1968, attributed to the series' high cost.
- At conventions, insisted that his booth or table be separate from the rest of the cast members of Lost in Space (1965). He refused to be in the same part of the building as June Lockhart and convention coordinators had to accede to his demands - he was a major draw to conventions.
- Was a commercial spokesperson for Chevrolet in 1949.
- His final acting voice-over role was Hubert's Brain (2001).
- Had 12 hobbies: watching movies, playing piano, dancing, listening to opera, gardening, knitting, cooking, traveling, magic, painting, reading, and spending time with children.
- Just before his death, Harris was involved in the NBC project of "Lost in Space: The Journey Home" in which the Robinson family may be returning to Earth.
- When he wanted to be an actor, he refused to tell his parents about his name change.
- Before future director John Lasseter would work with him on both movies: A Bug's Life (1998) and Toy Story 2 (1999), he would describe Harris, as his childhood television hero.
- His widow, Gertrude Bergman, was his school sweetheart. She passed away on August 28, 2007 at age 93, only 5 years after his death.
- Remained good friends with Bill Mumy during and after Lost in Space (1965).
- In 1977, his father, Sam Charasuchin, was struck by an automobile and was found dead.
- Had a long association with Irwin Allen, for 26 years. In 1995, Harris along with the other "Lost in Space" crew paid tribute to Allen, who died four years earlier.
- He was the co-star of The Bill Dana Show (1963). Much of his banter from that show was used on the robot in Lost in Space (1965).
- Was reunited with ex-Lost in Space (1965) co-star, Bill Mumy, alongside Leonard Nimoy (of Star Trek (1966)) at a Disney World Convention Center in Orlando, Florida (1996).
- Was a frequent guest on the Opie and Anthony radio show
- When he was attending high school, Jonathan was interested in archeology, Latin, romantic poetry and Shakespeare.
- Was involved in every re-writing of the script on Lost in Space (1965).
- In 1966, he was reunited with Michael Rennie to guest-star on Lost in Space (1965), which also starred Harris and Guy Williams.
- Had attended the funeral of Bill Mumy's father, Charles William Mumy Sr., after he passed away in August 1995.
- His Broadway debut was in the play "Heart of the City" (1942).
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