Ah this old chestnut, in polite circles called Fanfiction and less polite cicles called Fanwank, has been a staple of the audience probably since the dawn of fiction.
Many of my favourite films are based either on series of novels or are part of linked series so aren’t really standalone. They are linked either by a storyline (the Hunger Games), character or characters (James Bond series, Tinker Tailor Solider Spy, Hunt for Red October) or a mix of both (Twin Peaks: Fire Walk with Me), or they are so well closed there would be no point in a sequel. Where would Blue Velvet go in a sequel for example, the implication at the end is the entire film is a dream in the leads head and if not the story is pretty much closed anyway. The Long Good Friday ends with Bob Hoskins set off to a watery grave, short of a miraculous intervention by Bodie and Doyle it again is a closed narrative.
Maybe perhaps the Time Machine movie from the Sixties, that could continue with the Time Traveller perhaps going backwards in time from his future paradise to see events in the past or to a point in future history to see how the future world split the population in the Eloi and the Morlox.
I did toy once with writing a musical based on the Time Machine and using atypical time signatures in the song structures as a sort of in joke, but I never really put serious thought into it.