* ActorAllusion:
** When the heavenly whippet looks in Charlie's records, his mother and father are named "Loni" and "Burt", and look like canine versions of Loni Anderson and Burt Reynolds (who were together at the time.) Loni also appears in the film as one of Charlie's "close friends".
** Don Bluth's birthday is also September 13, 1937. The idea that every human year is seven dog years is a myth -- Charlie is about 25. Even though he seems older.
* CelebrityVoiceActor: As well as Burt Reynolds voicing Charlie, the German dub has him voiced by the equally rascally Harald Juhnke.
* DuelingMovies: Released on the very same day as (and promptly slaughtered by) ''Disney/TheLittleMermaid.''
* ExecutiveMeddling: We were originally going to get to ''see Charlie's body'' flying off the pier (a rare example of a meddling executive making a good call). Interestingly, many book adaptations of Don Bluth films include unused artwork; ergo, the tie-in book for this film showed a very clear silhouette of Charlie's body flying alongside the car...
** Burt Reynolds (voice of Charlie) stated once that there was supposed to be some swearing in the film, and he distinctly recalls recording cuss words in his dialogue. All of it was removed to make the film [[AnimationAgeGhetto more appropriate for children.]]
* NamesTheSame: [[InvokedTrope Invoked]]. The title came from a book Don Bluth's teacher had read to him when he was a child. It was an anthology of stories about a noir-style dog detective. Bluth only remembered the title and looked it up years later when he became a filmmaker, but decided that he didn't like the story and based an entirely new one off of the title.
* NonSingingVoice: In the first film. While Judith Eva Barsi was only Anne-Marie's speaking voice, the film developers had adult actress, Lana Beeson, to do the singing voice for Anne-Marie in the SugarWiki/{{heartwarming|Moments}} TearJerker song, "Soon You'll Come Home". Barsi did audition for the singing part but [[PaterFamilicide because she broke down in stress from events at home during the audition]], the filmmakers decided not to push her.
** Otherwise averted in the entire series, where many of the characters are played by professional singers.
** Subverted, considering the fact that Burt Reynolds, Dom [=DeLuise=], Ernest Borgnine, and Charles Nelson Reilly all get songs over the course of the series. It seems that the one thing each installment had in common was giving songs to actors who couldn't sing professionally.
* TheOtherDarrin: Save for Dom [=DeLuise=] and Charles Nelson Reily as Itchy and Killer, respectively, none of the actors from the first film are in the sequel or TV show.
* RealitySubtext: Consider the [[http://z7.invisionfree.com/thegangoffive/index.php?showtopic=981 circumstances]] surrounding Creator/JudithBarsi's untimely death. Now try to watch the film without cringing violently. This may also explain the FamilyFriendlyFirearms.
* TheRedStapler: Watching this movie WILL make you want to get a German Shepard.
* [[TalkingToHimself Talking To Herself]]: Annabelle and Belladonna are both played by Bebe Neuwirth.
* SleeperHit: The first film, it did poorly in the box office but became one of the greatest-selling home video releases of all time. This is what prompted MGM to have the sequel made.
* TropeNamer: For BigLippedAlligatorMoment, indirectly, through WebVideo/TheNostalgiaChick.
* TroubledProduction: The sequel, according to [[WordOfGod the directors]], was originally animated in Dublin, Ireland (where Bluth's original studio, which produced the first film, used to take place before that). But then, after Screen Animation Ireland, the Dublin studio in charge of the animation, shut its doors, the animation has to be outsourced to several studios in countries like Taiwan, Korea, Canada, and Denmark in order for the film to meet up the deadline.
* WagTheDirector: Burt Reynolds and Dom [=DeLuise=], who had developed a repertoire with one another after starring in several movies together, insisted that Don Bluth leave the room during recording sessions so that they could improvise off one another better, to Bluth's chagrin.
* WhatCouldHaveBeen: The film was originally meant to be the third collaboration between Bluth and Creator/StevenSpielberg, but Spielberg quit after the two butted egos on ''WesternAnimation/TheLandBeforeTime''.
** Charlie was a detective in the original draft and the film was going to be an anthology of three short stories.
** The Hell sequence was supposed to be a lot longer than it was in the movie.

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