Yikes! I'm watching Super Monster now and just finished the scene where the kid is dreaming of Gamera flying past the Space Battleship Yamato, complete with Yamato music theme!
"I must......be dreaming! ..........wish it was real...."
Edit: HA! And a little bit later, after the footage from Barugon where Gamera destroys the dam, there's a slam on Godzilla! You see Gamera's feet walking by a fence, and a posterboard for a Godzilla movie falls over, complete with silly music!