Galactus is show as or in a cloud in the film. Obivously because they didn't want it to look stupid. Galactus is some massive dude that flys in a spaceship bigger than planets, I don't think they could have pulled it off any other way other than putting him as a giant cloud. But anyway... You do actually get to see a little glimpse of Galactus in the cloud. You can't see any details on his face or anything (He is mainly show as an explosion/fire), but you can see the shadow/outline of his helmet. I am CERTAIN it is him. Anyway, just watched the last part again on Tv-links and screenied the bits where you see him.
http://i11.tinypic.com/4tflevc.png
In the two pictures above you can just about make out his helmet. Espically in the second picture. Just look at the darker part of the cloud.
http://i16.tinypic.com/674z8lg.png
In the first picture of the three pictures above, if you look at the darker parts of the explosion you can see the outline of his helmet. It even looks like you can see an eye and mouth in that bit aswell.
In the last two pictures you can obviously see Galactus' helmet. I know some people will probably go 'Oh thats just an explosion and the pattern it exploded in.' Well, the explosion/fire stays in the same position throughout that scene. Explosions cannot stay still.
You can see the resemblance!
http://kungfurodeo.com/wp-content/up...actus_head.jpg
http://kungfurodeo.com/wp-content/up...actus_wide.jpg
http://www.emeraldcitycomics.com/upl...TPB-754614.jpg
http://www.pigorfig.com/galactus/images/galactus3.jpg
http://www.marvel.com/universe3zx/im...tus442x350.jpg
Ok, I'm done now. :P