I'm surprised that Megalon from Godzilla Vs. Megalon wasn't mentioned. I am talking about the spit firing of the bombs, that is just the same thing repeated.
That's a good one too, mate. Yes the fireballs are repeated, but the after effect, where Godzilla and Jet Jaguar are surrounded by the wall of fire, was beautifully done. That was perhaps the best FX in the entire film. It had it's moments to be sure.
Had Toho done the same and gotten the optical FX printer that Tsuburaya Productions had, the overall FX might have been better. As it stands, Godzilla vs. Megalon was a fun movie.