Why was Jeff Goldblum's voice dubbed?

It probably is just what someone said before. They were shooting outside in NYC, probably didn't get clear audio, and it was likely months later when they were editing and realized they didn't have good audio for his voice in those shots. He was probably long gone moved on by then. He was not yet a well known actor, so rather than go to all the trouble of tracking him down and getting him in the studio for looping, they just used someone else who was conveniently on hand.

Now, you want a strange one, watch a 1980 sci-fi movie called "Saturn 3". It was directed by Stanley Donen ("Singin' in the Rain"). It stars Kirk Douglas and Farrah Fawcett. They sound like themselves, but the bad guy is played by Harvey Keitel. HIS voice was completely overdubbed, throughout the whole film. I am a Keitel fan, so it's very strange to watch that one, which is an English language, American production, and see Keitel dubbed out the whole time. His voice is replaced by what could best be described as a gay, hoarse-voiced Englishman. It seems quite odd.

Legend has it that Donen simply hated Keitel, couldn't stand him. Apparently went to all that trouble JUST to slap Keitel in the face. Keitel was stunned when he saw the finished film, and heard someone else's voice...

EDIT: I've just seen the film again since I wrote that. NOW, I see what they mean. It had been a while since I'd seen it. Goldblum is in a number of scenes, indoors and out, and he is always overdubbed by a very deep voiced guy. I now wonder if this situation isn't just the exact same thing with Goldblum and Winner as it was with Donen and Keitel, and perhaps it's just a case of a director who didn't like an actor or his voice, and just chose to dub him out.


Incidentally, on another note, here's a bit of trivia! I noticed that when the models (played by Christina Raines and Deborah Raffin) are on that crowded balcony, doing the wine commercial, where Jerry Orbach is the director, Goldblum is there,too, as a still photographer. Then, a crew hand is suddenly measuring the distance to one of the models, and I noticed he is character actor John Getz (in an early, one shot, one line bit role). He and Goldblum both appear in this scene and were both on that set that day. Ten years later, those same two actors were the stars of "The Fly". Goldblum played Seth Brundle, who becomes the fly-creature, and Getz played his rival, Stathis Borans. Also, Raines and Raffin played friends and co-models in this, and four years later co-starred as nurses and friends in the film, "Touched by Love".