The gremlins resemble the title monsters of Gremlins (1984) and Gremlins 2: The New Batch (1990), but their behavior on the plane also calls to mind the, as it were, original "gremlins". Gremlins were once known to the Royal Air Force as mischievous imps who sabotage planes. Whenever something went wrong and no one knew why, a gremlin was blamed. During his time in the Royal Air Force, author Roald Dahl heard this myth and wrote a story about them, making gremlins famous (or, perhaps, infamous) throughout the world.
Frank says the woman, with whom he tries to set Dracula up, is his "right arm's cousin". This was also what Johnny said in Hotel Transylvania (2012) when he was trying to convince Frank that they were related.
In the short film Puppy!: A Hotel Transylvania Short (2017) Released a year before this feature film, Mavis can be seen reading the travel brochure for the actual cruise ship from Hotel Transylvania 3, months before it was officially revealed to the public.
Genndy Tartakovsky didn't want the fishmen to bend forward because fish can only bend sideways so he asked animators to have the least amount of movement for them as possible; sometimes in scenes only their mouths or eyes move.
According to Director Genndy Tartakovsky, he returned after he got an inspiration from a "miserable" family vacation and major inspiration for the film from the National Lampoon's Vacation movies, as the film would take place aboard a cruise ship.
The underwater volcano was a challenge because the movie is bright and colorful while real underwater volcanoes are dark and scary. The film's VFX Supervisor, Michael Ford had the idea for it to be red under-lit to make it pretty and bright.
In order to figure out how to animate a scene in which champagne is thrown at Drac's face, the head of model rigging had a champagne bottle opened towards his face a dozen times to see how it works (apparently it stings).
The cruise ship in the film, the "Legacy", bears a very strong resemblance to the R.M.S. Titanic and her sister ships R.M.S. Olympic and R.M.S. Britannic -- the Legacy has five smoke stacks instead of four like the ships R.M.S. Lusitania and R.M.S. Mauretania, and is rather cartoonishly shorter and fatter than the real-life ocean liners. Fortunately, however, the film takes place in the tropics, so icebergs are not a hazard.
This movie was going to be released on September 21, 2018, but it was pushed forward two months to allow Goosebumps 2: Haunted Halloween (2018) to take that date, though that film would later be pushed back a month to October 12th.
Dennis' giant dog Tinkles was first introduced in the short film, Puppy!: A Hotel Transylvania Short (2017) which released in theaters in July 2017. He was initially supposed to only have a brief cameo in Hotel Transylvania 3 but audiences responded so strongly to his character that his part became a key roll in this film.
In Hotel Transylvania (2012), Dracula said garlic makes his throat swell, and in Hotel Transylvania: The Series (2017) it's shown that vampires exposed to garlic are contagious and must be quarantined, but in this film, it actually causes flatulence. However, it was garlic oil that caused the flatulence. For all we know, straight up garlic does make his throat swell.
In June 2016, Sony Animation also confirmed that Director Genndy Tartakovsky would be returning for the third film, after taking a leave of absence to work on the final season of his show Samurai Jack (2001).
When the monsters are all playing a version of volleyball on the ship before reaching the first destination, Johnny mentions playing college volleyball for his school, Santa Cruz. Santa Cruz is one of the public universities in the University of California system, University of California, Santa Cruz or UCSC. Like Johnny, kids at Santa Cruz are stereotyped for being more laid-back and "hippie" like.
Sony Animation's first theatrical triquel. This does not include Open Season 3 (2010), as that film was released straight to DVD, same said for Smurfs: The Lost Village (2017), which was a CGI remake to the live action Smurfs films rather than being another sequel.
When Ericka is going through the hidden temple in Atlantis, with Dracula following, and Mavis following him, and cautiously goes down the chasm, it is in close comparison to the movie poster for 127 Hours (2010).
In September 2015, Producer Michelle Murdocca said before the second film's release that the studio was "talking about number three and moving forward and taking the franchise to the next level", but she and Director Genndy Tartakovsky would not return, since they were working on Genndy Tartakovsky's Can You Imagine? before that project was later shelved. That same month, Genndy revealed that he would not be returning for the sequel, telling TheWrap that "two is enough. I have a lot of other ideas, and I kind of have to express them and have them come out."
A video game adaptation, titled "Hotel Transylvania 3: Monsters Overboard" has been released for the PlayStation 4, Xbox One, Nintendo Switch and Microsoft Windows on July 10, 2018. On June 21, 2018, Amazon announced it was offering its Amazon Prime members an early showing of the film on June 30 at about one thousand theaters, similar to fellow Sony release Jumanji: Welcome to the Jungle (2017) the previous December.
It was important to Genndy Tartakovsky to create a character that's a match for Dracula, not just emotionally but physically. Dracula is the most pushed character - he can do anything so Ericka was created to do the same.
This is the only film in the franchise to not have any characters voiced by Rob Riggle. In Hotel Transylvania (2012) he voiced the Skeleton Husband in the scene when Johnny first witnesses the hotel, and in Hotel Transylvania 2 (2015) he voiced Bela the Bat Monster, the film's main villain who despises humans that used to be with Dracula's father Vlad.
The only film in the franchise to not have any characters voiced by Jon Lovitz. In Hotel Transylvania (2012) he voiced Quasimodo Wilson the Chef, the film's hidden main villain, and in Hotel Transylvania 2 (2015) he voiced Erik. Lovitz may return in sequels after this film.
The tenth theatrically released animated triquel after Pokémon 3: The Movie (2000), Rugrats Go Wild (2003), Shrek the Third (2007), Ice Age: Dawn of the Dinosaurs (2009), Toy Story 3 (2010), Madagascar 3: Europe's Most Wanted (2012), Kung Fu Panda 3 (2016), Cars 3 (2017), and Despicable Me 3 (2017).
Including the straight-to-DVD sequels of Open Season (2006) and Surf's Up (2007), this is Sony Animation's twenty-first film to be rated PG by the MPAA, which all Sony Animation films were rated. This does not include Sausage Party (2016) which had a different rating and is not from Sony Animation but from an entirely different company called Point Grey which is also from Columbia Pictures.
The first teaser trailer was released online on November 16, 2017, one day before the release of fellow Sony Pictures Animation film The Star (2017). The official trailer for the film was released on March 21, 2018. A 95-second sneak peek of the film was released online via Sony Pictures Entertainment's YouTube channel on May 7, 2018.
Most of Sony Animation's franchises do not have any consistent time gaps as Open Season (2006-2010) and The Smurfs (2011-2013) did so while the others like Surf's Up (2007-Present), Chance of Meatballs (2009-Present), Hotel Transylvania (2012-Present), Goosebumps (2015-Present), The Angry Birds Movie (2016-Present), The Emoji Movie (2017-Present), and Peter Rabbit (2018-Present) did not do so yet.
Sony Animation's seventh fully animated film to not be accompanied by a short film after Open Season (2006), The Pirates! Band of Misfits (2012), Hotel Transylvania (2012), The Angry Birds Movie (2016), Smurfs: The Lost Village (2017), and The Star (2017).
The trivia items below may give away important plot points.
Among the clippings on Van Helsing's map of Atlantis is the picture of a sound-wave. This appears to be The Bloop, a mysterious low frequency sound detected in the South Pacific in 1997 by NOAA. Now confirmed the sound of a moving iceberg, it was then proposed to have been produced by a giant, undiscovered sea monster. Fittingly, the movie features a giant singing sea monster in its climax.
One idea in Hotel Transylvania (2012) that was dropped pertained to Johnny being a descendant of Abraham Van Helsing, which would have created more conflict between Dracula and Johnny. This movie finally properly introduces the Helsing family into the setting, but makes the descendant Dracula's love interest instead.
The scene in the movie where Blobby gets seasick and creates Blobby Baby was different from the scene in the trailer. In the trailer, Dracula and friends react to Blobby getting sick and changing colors, with Dracula saying, "Oh no, Blobby's gonna puke!" just before Blobby hurls out a baby.
Ericka being a Van Helsing is hinted at during her introduction before it's confirmed, such as when she acts hesitant to touch or get close to some of the monsters, and when she compliments Dracula by saying "I'd kill for that skin."
The scene where Ericka is routinely trying to kill Dracula in various ways, all while he's blissfully dancing around the ship to the tune of "24K Magic" by Bruno Mars, is changed in the international version to "Gangam Style" by PSY.
Famous Dutch music artist and producer, Tiësto, provided the song used by Abraham Van Helsing to control the Kraken. Tiësto established a residency in 2013 with the Hakkasan Group performing in their Las Vegas nightclubs. His current residency with them was extended to 2020.
When Blobby becomes seasick (Dracula says, "Oh, no! Blobby's gonna puke!"), he pukes and the mess he made becomes Little Blobby, resulting in Blobby becoming a father, assuming that's how Blob Monsters are born, and how Wendy from Hotel Transylvania: The Series (2017) came about.
The only "Hotel Transylvania" film not to feature the Columbia Pictures logo before it starts. The logo was notable in the first two, as the figure of Columbia herself turns into Mavis' bat form. This is also Sony Pictures Animation's second theatrical film to not have the Columbia Pictures logo at the beginning, after The Star (2017).