Johnny Galecki was first introduced as "Kevin Healy", but immediately became "David" from his second appearance on. The reason for this was that Johnny was appearing on another show at the time with the character name of "David", which is what Roseanne Barr wanted to call him..
Similarly, you may ask, why did they change DJ on Roseanne?
WHY THE ORIGINAL DJ DIDN'T STICK AROUND. That's because the character of the youngest Conner son was originally played by Sal Barone. Shortly after the pilot was filmed in 1988, the Writers Guild went on strike. By mutual agreement, Sal Barone left the show and was replaced by Roseanne-lookalike Michael Fishman.
Beside above, what happened to David and Mark on Roseanne? Glenn Quinn, the actor who played Mark, passed away of an accidental drug overdose in 2002, so it's likely his character has also passed away. On the revival's premiere, Jackie mentions that Becky's husband has passed away. So it's likely that Roseanne's marriage swap in her fiction writing was just that: fictional.
In this manner, was Darlene really pregnant on Roseanne?
There is some discrepancy in the series continuity with regard to the character's age. Darlene announced she was pregnant in a 1996 episode during season 8 of Roseanne, and Harris was born in a 1997 episode during season 9.
Why didn't mark come back on the new Roseanne?
It's really no big surprise that Roseanne chose to have the character of Mark be dead in the new episodes. Glenn Quinn, the actor who played Mark for the original run, died in 2002, and it was thought that the revival would use the death of his character as a good way to honor him.
Related Question Answers
Is Jerry Roseanne's real son?
Baby Jerry on _Roseanne_ (above), Morgan and Cole today (bottom). Actress Roseanne's actual pregnancy with real-life son Buck Thomas was written into the show during Season 8. Three months after her character became pregnant on the sitcom, Roseanne conceived her son via IVF.What happened to Jackie's baby on Roseanne?
Andy was born as the son of Jackie and Fred in a Season 6 episode of Roseanne that aired in August 1994, but he was noticeably absent when the sitcom was revived three years ago (and he continued to be MIA when Roseanne morphed into The Conners in 2018). The Conners returns with the second half of Season 2 on Jan.Why was Becky Conner recast?
By Season 6, the Roseanne producers wanted Becky to appear more frequently on the show, so they recast the role — and Sarah Chalke won the coveted part. Lecy later briefly returned to Roseanne for Season 8, but again left the series and Sarah played Becky in the show's ninth and final season.Did Roseanne wear a wig season 6?
The Roseanne logo and the Conner kitchen both looked different in the pilot, which was titled Life and Stuff, after the series original working title. Laurie Metcalf wore a curly wig in this and other early episodes to look more like Roseanne's real life sister.Why did Becky leave Roseanne show?
Alicia "Lecy" Goranson was the first and original Becky Conner. She left the series at the end of the end of Season Four in order to attend Vassar College full-time. Or so went the official explanation. She re-appeared as Becky for what was supposed to be the final season of Roseanne, and then left the show again.How did Mark Healy die?
Mark Healy did not make an appearance in the Roseanne reboot because of Glenn Quinn's untimely death. In December 2002, Quinn passed away from an accidental drug overdose. His body was found at a friend's home in North Hollywood, California. He was 32 years old.How much is Roseanne Barr worth?
Roseanne Barr Net Worth and Career Barr has an estimated net worth of $80 million, according to Celebrity Net Worth, largely due to her income from her three decades in entertainment. Now fired and dropped by her agent, she stands to lose millions of income she would have earned from the next season of “Roseanne.”Why did the original Becky get replaced on Roseanne?
Lecy Goranson was the original Becky, playing the character on five seasons between 1988 to 1992 before exiting the show to pursue an education at Vassar College. This allowed for Goranson to continue her studies and make brief appearances before she was replaced by Sarah Chalke in the sixth and seventh seasons.Did Becky lose her baby on the Conners?
Some mild spoilers are ahead for The Conners Season 2 premiere. Ready? Alright, if you watched the premiere, you'll know that Becky had her miracle baby and survived her surprise, "geriatric" pregnancy, but little Beverly Rose Conner was, unfortunately, born two months premature.How old is Becky supposed to be on the Conners?
Becky is a successful, popular 14-year old who does extremely well in school and is likely to be the first Conner in college. She supports her mother and father who work blue-collar jobs and lobbies successfully to be put in charge of babysitting at home.Does Lecy Goranson have a child?
Major changes are ahead this season for Lecy Goranson's character Becky as she gives birth to her first child and has to deal with the myriad of complications of life as a single mom.How did Becky on the Conners get pregnant?
On Tuesday's episode of "The Conners," viewers learned Becky Conner [Lecy Goranson], is pregnant. The news came after Becky had told her dad that she was getting nauseous at the Mexican restaurant where she works. Becky wouldn't reveal the identity of the father, because at first she wasn't sure who it was.Is David coming back to Roseanne?
(CNN) David is back to climbing in through windows on "Roseanne." Johnny Galecki will make a guest appearance on Tuesday's episode of the rebooted comedy, returning to his role as David Healy, the husband of Darlene Connor's character played by Sara Gilbert. It's not the first time Gilbert and Galecki have reunited.Who died on Roseanne?
Dan Conner had a heart attack in the second-to-last-season cliffhanger of “Roseanne.” He survived. Until he didn't. John Goodman's character, it was revealed by Roseanne in the last season's closing minutes in 1997, had really died at his daughter's wedding. The audience spent 24 episodes believing he pulled through.Are Mark and David Brothers on Roseanne?
About David. David is the husband of Darlene, as well as the father of Harris Conner Healy. He is the younger brother of Mark Healy and the brother-in-law to Becky Healy, D.J. and Jerry Conner. He is the son-in-law to Roseanne and Dan Conner.What happened to Darlene's husband on Roseanne?
In the Roseanne reboot, he's the ex-husband of Darlene (Sara Gilbert), the Conners' acerbic middle-child. They have two children, daughter Harris and son Mark, the latter likely named for David's older brother, who was married to Darlene's older sister Becky (Lecy Goranson) until he died offscreen.How many Becky's were on Roseanne?
In its nine seasons on the air, Roseanne was a tale of two Beckys: Alicia “Lecy” Goranson, who originally played the oldest Conner daughter, left the show after five seasons to go to college.When did Becky change in Roseanne?
Chalke took over the role of Becky Conner during Season 6 in 1993 after Goranson left the show to attend college. It was announced that Chalke would be among the cast for the revival, but Goranson already had been cast to reprise the role of Becky. 
