When the Falcon enters the remains of the Alderaan system Leia's voice could mysteriously call out, "Asteroids!" and then the asteroids sequence from ESB could start until the caption WRONG FILM flashes over the sequence. The film would then return to the correct position.
In RSB the asteroid sequence from AOTC could start to play in and end in the same way.
The gag could be continued with the shot of the TIE fighter pilot in ROTJ cutting to the Death Star attack from ARH