Leroy & Stitch (2006 Video)
Jumba's reaction while looking at the black hole is similar to Doctor Doppler's reaction to the black hole.
Dr. Hämsterviel says he is sending Jumba, Pleakley, and Stitch to coordinates 12-21-979, which is the release date of The Black Hole (12/21/1979)
When Leroy is searching for all the experiments, the theme song to the TV show Hawaii Five-O is playing.
DVD release reviewed + footage used
Jumba turns the volume up to "11".
When Hämsterviel is in jail at the end of the movie, the other imprisoned Leroys in cells around him start dancing to the song.