Sometimes a clue is provided in one movie about a person that will be in another movie, even if they are unrelated.
https://www.youtube.com/watch?v=aDm4L7gjYNs At the 1:18 point, the bat at the top of the hat is revealed. Then at 1:20 the bat wings can be seen. Then at the 1:30 point, the entire hat costume is shown.
https://www.imdb.com/title/tt0094721/mediaviewer/rm3416158464
https://comicbook.com/gear/news/beetlejuice-with-carousel-hat-funko-pop-order-walmart
https://screenrant.com/beetlejuice-movie-facts-trivia-secrets
https://www.hollywoodreporter.com/lists/cast-beetlejuice-1084016/michael-keaton-as-betelgeuse
https://en.wikipedia.org/wiki/Beetlejuice#Potential_sequel
https://screenrant.com/beetlejuice-2-sequel-development-delay-explained-details
https://www.altpress.com/news/johnny-depp-beetlejuice-2-casting-rumors
https://broadwaynews.com/2021/09/13/beetlejuice-to-reopen-on-broadway-in-april-2022
https://www.imdb.com/title/tt0094721/mediaviewer/rm2978438656
Beetlejuice (1988) "Principal photography began on March 11, 1987." https://en.wikipedia.org/wiki/Beetlejuice#Filming
Batman_(1989_film) "It was shot at Pinewood Studios in England from October 10, 1988 to February 14, 1989 with 80 days of main shooting and 86 days of second unit shooting." https://en.wikipedia.org/wiki/Batman_(1989_film)#Filming
Most people wouldn't have noticed the subtle symbolic Batman foreshadowing in the Beetlejuice movie.
https://thedigitallabyrinth.blogspot.com/search?q=Batman
While Beetlejuice and Batman aren't in the same universe, some people wonder if there is a connection between The Matrix and John Wick.
https://thedigitallabyrinth.blogspot.com/search?q=Neo+and+John+Wick
