Michael Seth Starr, in his book Hiding in Plain Sight: The Secret Life of Raymond Burr, perpetuates the inaccuracies regarding GODZILLA.  He refers to it as shot "on the cheap, with cheesy special effects" and, of course, "(badly) dubbed." 

When GODZILLA 1985 was offered him "much to the surprise of many, he jumped at the chance..."  Starr says that Burr always had a soft spot for Big G.  " I like Godzilla.  I think Godzilla is a marvelous human creature.  None of us paid enough attention to him.  Godzilla came to be because we were using nuclear power badly.  I'm sure Godzilla was trying to warn the world, although he was killing a lot of people doing it.  Or she was."

Starr says Burr was offered "a boatload of money, again for just one day's work."  "When they asked me to do it the second time I said, 'Certainly,' and everybody thought I was out of my mind.  But it wasn't the huge sum of money.  I wasn't bad in the second GODZILLA.  I wasn't good.  I was just nothing in it.  We called him Mr. Martin in the second picture because Steve Martin the comedian came up in between times."