* AuthorExistenceFailure: Jonathan Larson, the guy who wrote the libretto and plot, died on the night of the final dress rehearsal. Which provides the perfect illustration of the show's message that you never know when your life will be over, so you should do as much as you can all the time.
* CastTheExpert: Roger is usually played by a guitarist.
* CutSong:
** The stage show is nearly entirely sung-through; the movie converts several songs into dialogue or nixes them completely. Notable cuts include the various "Tune-Up" and "Voicemail" sequences, "We're Okay", "Christmas Bells", "Happy New Year" and "Contact". Furthermore, "Halloween" was recorded and filmed, but cut from the theatrical release. Less than 1/3 of "Goodbye Love" made the cut.
** Not to mention all the songs that got cut from the stage version. Some are rather bad ("[[https://www.youtube.com/watch?v=Xe1gJDuWrfs You'll Get Over It]]"--a duet between Mark and Maureen about her dating a woman--made him sound like an ignorant lout and her like a callous whore). Others, like "[[https://www.youtube.com/watch?v=ZWwviipzgY0 Real Estate]]" (a trio between Benny, Mark, and Alison where she and Benny try to convince Mark to give up filmmaking and go into the real estate business with Benny instead) were cut for length. Some would keep their melody with their lyrics being almost entirely rewritten, like "[[https://www.youtube.com/watch?v=jiH29pTi5nA Right Brain]]" would become "One Song Glory".
** The high school edition of RENT cuts ''Contact'' on account of the onstage orgy.
* DawsonCasting:
** Mimi "You look like you're sixteen." "I'm ''nineteen'', but I'm old for my age!" Marquez, originally played by the ''27-year-old'' Daphne Rubin-Vega (though, since many of the other characters are only mid-twenties, the potential exists for them as well).
** The age of the cast in the film seems to add to this as well -- most of the actors were in their thirties at the time, and while their ages weren't set in stone in the play or film, they certainly felt more like twenty-something "starving artists".
** The 20th anniversary tour in the UK removed the line about her age entirely due to Mimi being played by the gorgeous but in no way teenager like 32 year old Kerry Ellis.
* TheOtherDarrin: Only Mimi and Joanne are recast in place of the originals for the movie, because Daphne Rubin-Vega was pregnant at the time and obviously gained too much weight to play a junkie dancer with AIDS, and Fredi Walker felt she was too old to portray a recent law school graduate. Her one request was to keep Joanne black.
* RealLifeWritesThePlot: Inverted -- Jonathan Larson wrote this in memorial to his friends who had died of [=AIDS=], but it's almost as if he wrote his own memorial. See the book "Without You" by Anthony Rapp for details.
* ReferencedBy: See ReferencedBy.{{Rent}}.
* RomanceOnTheSet: Taye Diggs and Idina Menzel; Wilson Heredia and his makeup artist from the movie. In the 2007 Australian production, Anthony Callea (Mark) and Tim Campbell (Roger).
** Unfortunately, after 10 years of marriage, Taye Diggs and Idina Menzel divorced but still remain best friends.
* UnintentionalPeriodPiece: The movie, starts on Christmas Eve 1989, but the show has always been synonymous with TheNineties. The internet and VirtualReality as [[NewMediaAreEvil an evil takeover plot]], AIDS spreading like wildfire, etc. However, the movie also created [[AnachronismStew a serious anachronism]]: The ''Film/ThelmaAndLouise'' joke in "Today 4 U".
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