Do you know many episodes of various shows where they were dreams or set in the past or whatever?
Ones I can think of are :
Magnum P.I - 1930's setting. His African-American buddy flew a plane not a chopper...
Days of our lives : a mum and dad read out a fairy tale to a kid. Amongst the kings and queens is Arleen Sorkin as a Harley Quinn like court jester!
Adventure Time _ Fiona and cake
Malcolm in the middle - Mum dreams she has girls not boys. Features some uncanny female versions and the oldest boy in drag.
Batman -brave and the bold : nods to elseworlds
Others?