Oustanding conveniance in a Godzilla film

Concerning the Mechagodzilla 2 scene; Rodan was still alive, and he flew onto Godzilla, and Rodan died saving him.

Some of these aren't conveniances or contrivances, really...

The MechaGodzilla very much is, but that's because Toho wanted a new single to sell and Jun Fukuda did what he could to accomidate them. I've always found the head thing glaringly odd though.  I don't think it's conveniant. I just think it's a flaw. But that's okay. It doesn't distract from the overall story and fun that Godzilla vs. MechaGodzilla does such a great job of  pushing.

The missile explosion in 1985 I felt was a brilliant way to revive Godzilla. The entire movie exists to play on a cold war theme and the irony that Japan survived the atomic explosion just to find themselves against a re-energized Godzilla was fantastic. There were already plot points in place that suggested the missile was going to go off and be a threat of its own before Godzilla even made it to shore. Plenty of movies weave together plotlines like this.

As for Biollante, I don't see that being a big deal. I mean, why did she drop from the clouds to begin with? The answer is just because the story needed her to. That's probably more convenient.

And finally, Rodan was flying to Godzilla in order to sacrifice her energy. She didn't simply fall on him out of coincidence. This was a concious decision on Okawara's part since the original ending was considered a little too extreme. I don't think it's very well thought out, but it more or less works.

This isn't to say there are conveniant moments in almost every film in the series; but, at the same time, no more than most movies. For example say... The Dark Knight. (So the Joker staged an elaborate car chase just to get arrest on purpose in hopes that he would talk to Batman at a police station? Uh-huh... ;) )

My only question is... where does the music come from in the movie? 

Interesting thing about rodan, I just figured he was on his way to little Godzilla and not to big G

Getting struck by lightning  and 40 minutes later it making all Godzilla's wounds heal completely in Godzilla vs Mechagodzilla.

Jet Jaguar growing to a giant

A song from weeds waking up rodan and making him change into fire Rodan in GvsMG2

Small meganula stopping a black hole from hitting Godzilla

People comveniently waking up all the guardian monsters as Godzilla came back in GMK, the rock piece conveniently falling into the water and landing on Ghidorah

Everything that happened in Final Wars