A list of film firsts. Please help add to/correct this list if you can.
The firsts are in the notes.
Last updated 25/2/21

Films not on Letterboxd:
Ally Sloper, Sloper's Visit to Brighton & The Katzenjammer Kids in School (All 1898) - First films based on a comic strip and a comic in any form.

An Exciting Honeymoon (1905) & The Life of a Cowboy (1906) - The first films to have a review of them published.

Hiawatha (1909) - Possibly one of the earliest independent films.

Arsène Lupin contra Sherlock Holmes (1910) - The first "crossover" film as well as the earliest known serial film.

Bags of Gold (1915) - First film to be shown at what is possibly the earliest drive-in movie theater, the Theatre de Guadalupe. It was opened in 1915 & later renamed to De Lux Theater before closing in 1916.

Vice Versa (1916) - First film to depict a body swap.

Men Who Have Made Love to Me (1918) - Earliest known film to break the fourth wall.

Drakula (Дракула) (1920) - Earliest known adaptation of Dracula.

Eine Symphonie des Kampfwillens (A Symphony of the Will to Fight) (1927) - First Nazi propaganda film.

Concert Magic (1948) - Earliest known concert film.

The Young Teacher (1972) - First film to be released commercially on VHS (In 1976).

Garden Isle (1973) - First film shot in OMNIMAX (An IMAX format).

The Sensorium (1984) - First 4D film.

Super Mario Bros.: Peach-Hime Kyushutsu Dai Sakusen! (1986) - First film based on a video game.

The Chorus (2013) - First film shot in 8K resolution.

Thanks to these Letterboxd users who have helped add to/correct this list:
-Mark Garrett
-Gustavo Menezes
-abzilp
-James Croxton
-fiene 🕊
-ShawnHallz
-Daniel Drayson
-DarwinEvolution
-Sethenstein
-ND03
-Frump
-Alexj_movieguy
-Adam Silverman
-Harrison Clark