* ActingInTheDark: Legend has it that after each scene was filmed, Creator/HumphreyBogart and the writers would [[WritingByTheSeatOfYourPants sit down together and decide what should happen next]]. Creator/IngridBergman had no idea until the very last scene was filmed whether her character would leave with Victor or stay with Rick. However, as the film was shot out of sequence, several scenes were shot ''after'' Bergman knew how the film would end. In addition, the Hays Code in place at the time essentially made it a foregone conclusion that Ilsa would leave with Victor, since it required good to triumph over evil and marriage to remain sacrosanct (the affair between Rick and Ilsa in Paris was allowed ''only'' because Ilsa believed her husband dead, as she makes ''very clear'' in dialogue). As Creator/RogerEbert put it, any confusion Bergman would have had was "emotional", not "factual".
* ActorInspiredElement:
** It was Creator/HumphreyBogart's idea for Rick to be a chess player.
** Signior Ferrari wearing a fez and using the ''salaam'' hand gesture was Creator/SydneyGreenstreet's idea. He wanted to go even further with the assimilation into Moroccan culture, but this was deemed contradictory to the movie's theme of Casablanca being a city of outsiders.
* BannedInChina: The film was banned in Ireland due to its portrayal of the Nazis infringing on an act preserving wartime neutrality. A cut version removing dialogue about Rick and Ilsa's love affair was eventually passed, before the movie was released uncut.
* BeamMeUpScotty: The line is "Play it, Sam", not "Play it again, Sam". Hilariously enough, the first time Ilsa says it, she specifically tells Sam to play it ''once''.
* CaliforniaDoubling: The film was shot on the Warner Bros. backlot and at the Van Nuys Airport, a general aviation airport near Los Angeles. A lot of StockFootage was used for Paris and other locales for [[UsefulNotes/WorldWarII obvious reasons]].
* TheCastShowoff: Dooley Wilson (Sam) was a singer and bandleader in the 1920s as well as an actor, hence the inordinate amount of time that he spends singing. (Though he only pretends to be playing the piano.)
* ColbertBump: The song "As Time Goes By" was a very minor hit when it debuted in a long-since-forgotten Broadway musical over a decade before the film's release; thanks to this film, it became one of the most iconic standards of all time, to the point where the last few bars have been used as the musical stinger for Warner Brothers' production logo since 1998.
* CompletelyDifferentTitle:
** China: ''Spy''
* DarkhorseCasting: Creator/IngridBergman was not yet a household name in Hollywood when she was cast opposite Creator/HumphreyBogart.
* {{Defictionalization}}: There is a real Rick's Cafe in modern-day Casablanca that closely recreates the decor of the film.
* DVDCommentary: Creator/RogerEbert makes one awesome commentary track. He breaks down things such as shot design, subtle character motivations, the "La Marseillaise" awesomeness, and the MacGuffin disaster.
* EnforcedMethodActing: A rather famous albeit unplanned case of it during the Marseillaise scene. Many of the cast and crew had fled their home countries because were [[RealitySubtext very real victims of Nazi oppression]], including Creator/ConradVeidt and Creator/PeterLorre as well as many of the extras. So when you see all those French extras crying while singing their national anthem, they're crying for real.
* ExecutiveMeddling: The film was barred by UsefulNotes/TheHaysCode from having Ilsa leave her husband for Rick at the end; this led to the film's famous BittersweetEnding. The execs also refused to let Rick be arrested at the end, leading instead to the famous line, "Round up the usual suspects." In this case, the meddling made the film better for it.
* FakeNationality: A good portion of the cast, the most obvious being the very British Creator/ClaudeRains as French Captain Louis Renault.
** Austrian actor Paul Henreid played Victor Laszlo, who's Czech (though his name actually sounds Hungarian).
** Swedish Ingrid Bergman playing Norwegian Ilsa Lund. The two countries border each other and have a shared cultural history dating back to the Viking Age - but there was one ''very'' important difference between them in 1942: Norway was under occupation by Nazi Germany, and Sweden was neutral.
** Austrian Helmut Dantine as Jan Brandel, the young Bulgarian who tries to win the money for a passage to America at the roulette table. American Joy Page played Annina, his wife. She was one of only four American-born actors in the film (Bogart, Wilson, and Dan Seymour (Abdul, Rick's doorman) were the other three).
** Canadian Creator/JohnQualen as Berger, the Norwegian resistance fighter, and Canadian-born George London as one of the singers of the ''Marseillaise''[[note]] What nationality London is supposed to be is unclear, but it's unlikely that he's Canadian since Canada was at war since 1939[[/note]].
** British Sydney Greenstreet played the Italian Ferrari, [[NotEvenBotheringWithTheAccent without attempting an Italian accent]].
** Austro-Hungarian-American Peter Lorre plays the Italian Ugarte.
* FollowTheLeader: After the success of this movie, Hollywood decided they should try and get Humphrey Bogart to make it again. And again. Annnnd again. ''Film/ToHaveAndHaveNot'' is pretty similar (and very good), but could possibly claim plausible deniability. ''Tokyo Joe'' and ''Sirocco'', on the other hand, are basically just ''Casablanca'' set in other countries and with crappier supporting casts, writers, and directors.
* HostilityOnTheSet: Creator/PaulHenreid didn't get on well with his castmates, considering Creator/HumphreyBogart to be "a mediocre actor". Creator/IngridBergman, in turn, regarded Henreid as a "prima donna". Creator/ClaudeRains also disliked Henreid, nicknaming him "[[MaliciousMisnaming Paul Hemorrhoid]]".
* HypotheticalCasting: Joan Alison always envisioned Creator/ClarkGable as Rick Blaine, who "was my concept of a guy that I would like...I hated Creator/HumphreyBogart. I thought he was a common drunk". Creator/WarnerBros suggested Creator/JamesCagney.
* IronyAsSheIsCast: Dooley Wilson (Sam) was a professional drummer who faked playing the piano. As the music was recorded at the same time as the film, the piano playing was actually a recording of a performance by Jean Pummer who was playing behind a curtain but who was positioned such that Dooley could watch, and copy, his hand movements.
* JewsPlayingNazis: Conrad Veidt, who plays Major Strasser, fled Nazi Germany because his wife was Jewish, and would list himself as Jewish on identification documents in a show of solidarity with her.
* MagnumOpusDissonance: In her later years, Creator/IngridBergman admitted to being somewhat rankled that her role in this assembly-line wartime propaganda picture came to eclipse her more "important" and artistic films with [[Creator/AlfredHitchcock Hitchcock]] and [[Creator/RobertoRossellini Rossellini]] and [[Film/AutumnSonata her collaboration]] with Creator/IngmarBergman, among others; in her own words, all people ever wanted to talk about was "that one with Bogart".
* MidDevelopmentGenreShift: Murray Burnett and Joan Alison wrote the movie as a stage play, ''Everybody Comes to Rick's''. Creator/WarnerBros bought the rights to the play without being produced for US$20,000[[note]]before inflation[[/note]] in January of 1942, the highest sum ever paid for an unproduced play.
* MissingTrailerScene: The trailer contains a brief sequence of Rick saying "You asked for it" before shooting Strasser; the dialogue does not appear in the movie.
* PopCultureUrbanLegends:
** Rumors have circulated for decades about alternate versions of the movie airing on smaller, local TV stations (often in the 1970s), including one that supposedly cut out most implied references to sex (for example, making it so Renault wanted a woman to run an illegal errand for him instead of "spend time" with him). None of these alleged alternate versions have surfaced so far.
** Another rumor that's been around for decades is that the plane from the film's finale found its way to one of the Disney parks; depending on the telling, either it's the wreck you see in the Jungle Cruise or it was used as set dressing for the now-defunct Great American Movie ride. While the occasional Disney park cast member may have spread the rumor for the sake of entertaining guests, both are false. The plane in the film was a flat cutout, and no actual plane was used to film the final scenes. What makes the latter rumor so believable is how many actual film props and costumes really ''were'' used for the G.A.M. ride!
** While it's widely believed that UsefulNotes/RonaldReagan was considered to play Rick, the only evidence for this comes from early publicity materials. Film historians generally believe that this was done to help generate buzz for ''Film/KingsRow'' and Reagan was never seriously considered for the role.
* RealitySubtext:
** A number of the actors and extras were actually refugees of Nazi oppression, including Creator/ConradVeidt, who played Major Strasser (he hated the Nazis and spent much of his career playing Nazi officers who were evil, incompetent, or both as a way of striking back at them). This added extra meaning to the "Marseillaise" scene, as most of the emotion from the actors was genuine. It also adds more meaning to Ugarte's arrest, since Creator/PeterLorre was a Jew who fled Nazi Germany to escape exactly what happens to Ugarte. The line where he begs Rick, "Hide me!" particularly stands out.
** The film takes place during the first week of December 1941, its story concluding only a day or so before the real-life attack on Pearl Harbor. This casts Rick's attempt at neutrality earlier in the film, ending with him becoming an active participant in the conflict, as an allegory for evolving US attitudes towards the war.
* RecycledSet: The Casablanca airport was, depending on the scene, either [[CaliforniaDoubling Van Nuys Airport in Los Angeles]] or a foggy indoor set laid out in ForcedPerspective. Rick's cafe was built for the film (and then reused for [[Series/{{Casablanca}} the television series]] some forty years later). Every other locale in the movie is a set recycled from an earlier Warner Bros. production:
** The Casablanca street was built for the 1943 film version of ''Theatre/TheDesertSong'', which was released after ''Casablanca'' but filmed before.
** The Paris train station was earlier a Boston train station in the Creator/BetteDavis film ''Film/NowVoyager''.
** There was even recycling within ''Casablanca'' itself as the Paris street was a redress of the Casablanca street.
* RealLifeWritesTheHairstyle: Uniquely an example not affecting a film but preventing a change. Creator/IngridBergman cut her hair short to play Maria in ''Film/ForWhomTheBellTolls'' (who has hers cut by the Spanish fascists). They wanted to re-film a scene with different music in place, but Ingrid's change of hairstyle made this impossible. The original music "As Time Goes By" is now considered iconic.
* ScullyBox: Creator/IngridBergman was actually two inches taller than Bogart, which was made up for by him standing on a box or sitting on additional pillows when closeups were called for.
* SerendipityWritesThePlot: ''Everybody Comes to Ricks'', the unproduced stage play that this movie was based on, ended with Rick and Ilsa running away together to America; the movie only got its iconic BittersweetEnding because UsefulNotes/TheHaysCode forbade movies from showing characters getting away with adultery.
* StarMakingRole: For Creator/IngridBergman.
* StillbornFranchise:
** The film was successful enough that a sequel, ''Brazzaville'', was planned; Creator/HumphreyBogart and Creator/ClaudeRains signed on to reprise their roles, but Creator/IngridBergman was unavailable, which ''should'' have ended things right there, but Geraldine Fitzgerald was ultimately tapped to play Ilsa. By most reports, ''Brazzaville'' would have completely undone ''everything'' that made ''Casablanca'' great: Rick and Louis would ''both'' have been revealed to have been spies for the Allies, invalidating their apparently genuine CharacterDevelopment in the previous film, and Victor Laszlo finally would have met his end, freeing Ilsa to be with Rick without guilt (or that pesky Hays Office breathing down the studio's neck); this would result in a LoveTriangle between Rick, Ilsa, and a Spanish woman Rick had to seduce as part of his spy activities; ultimately, Rick and Ilsa would have wound up together and on a boat to the United States, living HappilyEverAfter. The studio (unsurprisingly) didn't care for this plot outline and (given that the war was winding down and Warner Bros. had a backlog of war pictures to get through before V-J Day) the idea of a sequel was dropped, and never revisited (at least on the screen).
** ''Two'' television series based on ''Casablanca'' have aired, both prequels set during the relatively brief period that Rick was running the cafe after fleeing Paris but before Victor and Ilsa arrive[[note]]The Nazis occupied Paris on June 14, 1940. The film begins on December 2, 1941, less than eighteen months later.[[/note]]:
*** The first aired in 1955 as part of the ''Warner Bros. Presents'' WheelProgram, which adapted several of their popular movies into series. Although a number of the minor players from the film returned for the series, none played their original part (Marcel Dallo, who played Emil the croupier in the movie, here played Captain ''Renaud''[[note]]changed from Renault[[/note]]; Dan Seymour, who played Abdul the doorman in the movie, here played Signor Ferrari). In addition to the several understandable absences (Ilsa, Victor, and Major Strasser), Ugarte is also missing, even though he and Rick obviously knew each other fairly well in the film. Rick himself was played by Charles [=McGraw=]; Creator/AnthonyQuinn was apparently in the running for the part but Jack L. Warner himself is said to have refused to allow him to play Rick; this is unlikely as Quinn had already won an Oscar in 1953 (and would win another in 1957) and television was seen as a major step down for movie stars at the time. The show lasted for only ten episodes.
*** [[Series/{{Casablanca}} The second]] aired in 1983, as a mid-season replacement on NBC. The cast lineup was almost as impressive as that of the original film: Creator/HectorElizondo played Captain Renault, Creator/ScatmanCrothers played Sam, and Creator/RayLiotta played Sacha the bartender. Creator/DavidSoul played Rick. Major Strasser is a regular character in this adaptation and there is an expanded role for his aide, Lieutenant Heinz (a very minor character in the film). Again, however, Ugarte is curiously absent. This series had an even shorter run than the 1955 series, with just five episodes produced.
* ThrowItIn:
** Legend has it that "Here's lookin' at you, kid" was improvised.
** Most of these extras in the National Anthem scene were Europeans displaced by the Nazis and the crying was genuine.
* WhatCouldHaveBeen:
** The iconic "La Marseillaise" sequence was intended to be even more pointed against the Nazis. The original song Major Strasser and the other Germans were to sing was not "Die Wacht am Rhein", a patriotic song written in 1840 and extensively used in the [[UsefulNotes/FrancoPrussianWar Franco-German War]] and in UsefulNotes/WorldWarI, but instead "[[https://www.youtube.com/watch?v=QeHfWLwEjVs Das Horst-Wessel-Lied]]", the Nazi Party anthem and unofficial second national anthem of Nazi Germany. However, Creator/WarnerBros changed it when they realized that the song was under copyright, which wouldn't have been a problem if the film were only being distributed in Allied territory. However as the film was also going to be released in neutral countries as well, it could have caused major diplomatic headaches and even opened Warner Bros. to the absurd possibility of being sued by the Nazis for copyright infringement. Or having to pay them royalties.
** Early press materials announced UsefulNotes/RonaldReagan as Rick, though it's generally believed by film historians that this was just a publicity gimmick for his film ''Film/KingsRow'', which came out around the same time, and he was never actually in the running for the role.
** Creator/OliviaDeHavilland, Creator/RitaHayworth, Creator/HedyLamarr, Creator/MargaretLockwood, Creator/MicheleMorgan, and Creator/AnnSheridan were strongly considered for Ilsa before Creator/IngridBergman got the part.
** Creator/JosephCotten was considered for Victor Lazlow.
** Creator/OttoPreminger was considered for Major Strasser.
** Later, there were plans for a further scene, showing Rick, Renault, and a detachment of Free French soldiers on a ship, to incorporate the Allies' 1942 invasion of North Africa. It proved too difficult to get Creator/ClaudeRains for the shoot, and the scene was finally abandoned after David O. Selznick judged "it would be a terrible mistake to change the ending."
** The Criterion Laserdisc of the film documents a treatment for a sequel named "Brazzaville" that never got produced. See the entry in StillbornFranchise for more details.
** Hal B. Wallis's first choice for director was Creator/WilliamWyler. Creator/HowardHawks was offered the job, but he turned it down in favor of ''Film/SergeantYork''.
** A remake was planned in the early 2000s by Music/{{Madonna}} set in war-torn Iraq. Seeing how iconic ''Casablanca'' is, you can see how well that turned out.
** Another was to star then-couple Music/JenniferLopez and Creator/BenAffleck.
** Creator/SydneyGreenstreet wanted to dress in traditional Moroccan garb for his role as Signior Ferrari to show him as [[GoingNative deeply assimilated into the local culture]], presumably to help underscore his status as a {{foil}} to Rick. This was overruled because it was seen as contrary to the recurring theme of pretty much every character being an outsider in one way or another. As a compromise, Greenstreet was allowed to wear a fez and use the traditional ''salaam'' hand gesture.
* WorkingTitle: ''Everybody Comes to Rick's''.
* WritingByTheSeatOfYourPants: The script was being written as it was filmed. Some things had to be changed to comply with The Hays Code, and it took a while to come up with a satisfying ending. It was pretty much reverse-engineered once the crew took a liking to the line "Round up the usual suspects": they should be rounded up because of a murder, the person killed should be Strasser, Rick should be the one to kill him, and Louis should say the line.
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