Shake It Up to The Flying Nun

Shake It Up characters appeared on Good Luck Charlie

Good Luck Charlie crossed over with Austin & Ally

Austin and Ally appear on an episode of Girl Meets World. Bringing the Disney Channel Live Action Universe into the Westphall Universe

Continuation of Boy Meets Wolrd

Boy Meets World and Step by Step both had episodes at Disney World and whiel in Disney World Eric from Boy Meets World met Dana from Step by Step.

The family from Step by Step was in the middle of a barbeque outside when Urkel from Family Matters came (literally) crashing in on the jetpack he had built on the last episode of Family Matters.

Family Matters' Urkel appeared in the first two episodes of Meego.

Meego (who was an alien) tried to contact his mother on the home planet by phone and instead the phone connected with Gilligan, Mary Ann and the Professor on Gillian's Island

Gidget and her family went on a cruise on The New Gidget and ended up on Gillian's Island.

The New Gidget was a sequel series to the original Gidget after 20 years

Both Gidget and Sister Bertrille from The Flying Nun mentioned in their respective shows that they were members of a rock band called The Gorries.