Episode 2: The Search for the Phantom Space Ramen, Baby
The official space currency is the Woolong. In fact, given that a certain fridge appears several episodes later, Space Dandy might share the same universe as Cowboy Bebop altogether. The folks that produced Bebop were heavily involved with Dandy, after all.
One of the visuals from the final sequence seems to be taken from the 1985 film The Quiet Earth.
Dandy becoming a Buddha in space 5.67 billion years into the future refers to the ending of a 1976 manga◊, Ankoku Shinwa (also known as Dark Myth).
Episode 8: The Lonely Pooch Planet, Baby!
Meow goes searching through the EXACT SAME FRIDGE from the Cowboy Bebop episode "Toys in the Attic", which was launched into space at the end of the episode. He even gets attacked by a blue mold inside, then eats it just like Ed did at the end of that episode. At least now no one will have to worry about getting sick with the menace gone for good this time, and Meow's Betelgeusian physiology probably let him digest that thing without turning ill, like the Bebop crew who had been infected by the creature.
Episode 10: There's Always Tomorrow, Baby!
At the beginning of the episode, Meow has what appears to be a McDonalds cup.
Other foodstuffs present are Loy's (Lay's chips), Pocky and a can that resembles Pringles.
The appearance of the Armed Legendary Equipment Legendary Giant Weapon is based on the Ideon in the Space Runaway Ideon series. This is perhaps no surprise given that veteran mecha designer Kunio Okawara was involved in the episode's production.
It also opens up the panels on its chest to reveal a lion's head that looks remarkably like that of either Daltanious or GaoGaiGar.
The A.L.E. also has a head and barrels reminiscent of a Guncannon.
Multiple occurences echo the Star Trek: The Next Generation episode "Cause and Effect", where the USS Enterprise NCC-1701-C and its crew are stuck in a time loop.
The crew begin realizing events before they happen at the bar, just like the Enterprise crew at the poker table.
Katie drops a glass in the bar scene, Just like Dr. Beverly Crusher in her cabin after hearing strange voices. (interestingly, Meow's mother is voiced by Crusher's Japanese VA in this very episode)
The flying car Dandy attempts to escape in explodes in midflight. At the end of every loop in the TNG episode, the Enterprise blows up just as Captain Jean-Luc Picard makes the order to abandon ship.
Possibly as an inverse reference, QT is the first to point out that every day seems to be the same. In "Cause and Effect", the android Data is completely oblivious to the potential of a loop until it is pointed out to him.
Recurring numbers also play a part in both episodes, with the number 8 appearing here (i.e., the 88th/108th loop), and the number 3 in The Next Generation.
The store shown after Dandy runs out of the bar bears the number "24". Eight times three equals twenty-four. This might be coincidental, but given that most of the similarities occur over a short runtime, possibly not. It is worth noting that in Japanese, the narrator also voiced Captain James T. Kirk in the original Star Trek dub, and the voice of Captain Picard has the role of Dr. H in episode 9.
The scene with Dandy, QT and Meow in an open field taking turns trying to destroy the calendar is very visually similar to the printer scene in Office Space.
Dandy's response of "there is a fourth" when the crew discover someone has come aboard the ship references the Japanese title of They Were Eleven.
QT's "Final Dandy" quiz show is a parody of Quiz Millionaire (the Japanese Who Wants to Be a Millionaire?). QT uses both the "is that your final Dandy?" catchphrase and host Mino Monta's famous habit of staring silently at contestants in suspense before announcing the right answer.
Dandy, QT, and Meow end up jumping from one universe to another, jumping through various animation styles, character designs, and laws of physics as they go. One of the universes was Attack On Dandy. In another, they're Mobile Suit pilots, with Dandy specifically being a Char Clone... literally.
Trucker Dandy, in the English Dub, makes a callback to episode 5, as he declares to his version of Meow that "Merry Companions are a Wagon in Space, Baby!"
When the fabric of reality is starting to collapse and everything starts making no sense anymore, the waitresses at Boobies are turned into muscular punks a la Fist of the North Star.
Episode 15: There's Music in Darkness, Baby!
Ukeleleman and his photorealistically-textured mansion would not feel out of place in Courage the Cowardly Dog: His character design, his unsettling movements, his behavior stemming from an intense and tragic psychological need, his ethnic-sounding leitmotif, his nonviolent yet creepy powers, his highly delusional behavior, the perpetual calmness of his voice, the attacking of the two characters closest to the protagonist forcing the protagonist to carry them out and flee, a surreal One-Winged Angel mode, and his spiritual fulfillment upon his defeat all parallel Courage.
During the space-surfing scene, the Space Battleship Yamato can be seen rising and crushing Dr Gel and Bea as it falls back into the River of Time.
Episode 17: The Transfer Student is Dandy, Baby
The music in school premise of the episode is pretty much GleeIN SPACE!.
It's given a Shout-Out in the dub after QT explains to Meow what the school is really like: "Oh, the glee he must be feeling".
Several scenes within this (especially the 'running up a steep staircase wearing geta' bit) are a callback to GunBuster in particular, and comes complete with a gloriously cheesy vocal theme that parodies the kind used in any number of similar montages in 70s and 80s anime.
Episode 19: "The Gallant Gentleman In Space, Baby!"
Dandy and Meow try to convince a bodyguard that they are both female, and quickly add "Everyone has a fault or two!", referencing Some Like It Hot's closing line ("Well, nobody's perfect!").
Episode 20: "Rock 'n' Roll Dandy, Baby!"
The names that Dandy and Johnny propose for their nascent band are all shout-outs to different Japanese musicians and album covers, most notably Tetsuya Rave Factory (TRF for short).
Johnny may as well be Johnny Yong Bosch incarnated within the show itself. He even has several features shared by some of his most famous roles.
He has red hair like Sasori and Ichigo Kurosaki. He also kicks people a lot like Ichigo, and his wardrobe wouldn't be out of place in Ichigo's closet.
He's the commander of the Jaicro Empire and pilots a mech like Lelouch Lamperouge. During one scene, a waiter even mentions that the dish he's brought comes straight from Britannia, and his commander outfit is almost exactly identical to the one Lelouch wears after becoming Emperor in R2.
The entire episode's premise is about him forming his own rock band. JYB actually does have his own rock band (Eyeshine).
While trying to get inspiration for a new song, there are sudden flashes that show a close-up of his eyes, referencing Lelouch as well as Yu Narukamiand Tohru Adachi.
Johnny setting his guitar alight with flame breath is of course a shoutout to KISS's Gene Simmons.
Dandy's hair catching fire during the concert brings to mind a similar accident to happened to Michael Jackson during the filming of a Pepsi commercial.
When Dandy is bribed into posing as the Dancinian, the chief of Grease bribes him with the 2012 Agnes Lum Photo Book. Lum was a Hawaiian gravure idol whose popularity peaked during the '70s-'80s in Japan. The same photo book can be seen here◊.
Additionally, the black and white graphics used during the universe's remaking are the same as graphics used in the finale of the film AKIRA.
Episode 23: Lovers Are Trendy, Baby!
In the beginning of the episode at the Alien Registration Center, Dandy and crew try to register an alien which according to Scarlett is commonly found at Nebula M78. The alien is so big we don't see all of it except for its silver boot.
The train preventing Scarlet and Dandy from seeing each other again parallels one of the final scenes in the film 5 Centimeters per Second, where Tōno and Shinohara miss seeing each other while the cherry blossoms fall. Both scenes will make viewers resent trains forever.
The premise of this episode is basically Flatland.
Planet Abbot is named after Edwin Abbott, the author of Flatland.
Episode 25: Dandy's Day in Court, Baby!
During the cross-examination of Meow, it's revealed that Dandy once tried to sell Meow at a pet shop, couldn't get a lot of money, and decided to keep him on the crew. This is much like how Ein joined the crew in the second episode of Cowboy Bebop.
The prosecutor claims that Dandy bought QT by accident; what he wanted was a robot like R2-D2.
As it turns out, the almost murder was committed by trying to kill the pitcher by having the bat break and the wooden shards pierce him.. Samurai Champloo had Mugen perform a very similar trick during the baseball episode.