A 1981 release by Jim Henson and his studio, The Great Muppet Caper was a sequel to The Muppet Movie and would prove to be the second in a long line of live-action Muppet movies.The story goes that Kermit and Fozzie are identical twin newspaper reporters (Yeah, we know, their editor doesn't get it, either) and Gonzo's their photographer. After nearly losing their jobs for missing a massive jewelry robbery scoop right under their noses, the intrepid trio head to London to get the follow-up story to said scoop as an exclusive to save said jobs. The robbery victim is Lady Holiday, who just happens to have wound up with Miss Piggy in her employ. Pig meets frog, frog thinks pig is Lady Holiday, pig goes along with it because she's smitten with frog, and all the while the thieves are closer than Lady Holiday thinks.This very silly movie has so many lampshade hangings they could open a store to sell them and have enough stock to last a week. Also very apparent are the highly increased production values compared to its predecessor, and the film debuts of some Muppets who showed up on The Muppet Show after the first movie. The movie also stars Charles Grodin in a role that strikes the right balance between serious villain and scenery chewing.
Call Back: A man knocks on the door to Nicky's office asking, "Mr. Holiday, did you order a gross of flowered socks?" Nicky can later be seen wearing said socks while unlocking the service door at the restaurant.
He is, in fact, still wearing them during the heist at the Mallory Gallery, even though he's otherwise dressed head-to-foot in standard cat-burglar black.
Digital Destruction: The most current version of the movie uses the songs as heard on the soundtrack album. As a result, several things are compromised:
During the "Night Life" number, Dr. Teeth isn't supposed to sing like he does on the album. This results in covering up some of Animal's "LOVE SONG!!" chants.
During the "Miss Piggy" number, the three dancers ("Happiness, Miss Piggy!") are clearly shown singing underwater, and are actually supposed to sound like it. Because the version from the album (which doesn't have this effect) is heard, the effect is completely messed up.
Not related to a song, but when Miss Piggy crashed through a window of the Mallory Gallery, there's supposed to be a kiai as she jumps towards Nicky. This is not heard in the current version of the movie.
Fozzie:[going over a checklist] Wax lips? Zoot: Aw man, I just had 'em. Dr. Teeth: Did you leave 'em in your other pants? Zoot: I don't have no other pants! Fozzie:[going back to the checklist] Yo-yo? Janice:[glancing at Zoot] Fer sure.
Even worse, the pedestal it's on at the museum is shaped like a baseball glove.
The Muppets and the villains then begin to play an impromptu Baseball game with said diamond, complete with Louis Kazagernote from The Muppet Show's "Wild World of Muppet Sports" segments doing commentary!
Possibly the best moment is as Kermit, Fozzie and Gonzo in their hot air balloon discussing the credits:
Fozzie: "Nobody reads those names anyway, do they?"
Kermit: "Sure. They all have families."
It's worth noting that this exchange comes in the first scene, and it keeps up from there.
And then there's this gem:
Miss Piggy: And you know something else?! You can't even sing! Your voice was dubbed!
At one point, Kermit and Miss Piggy break out of character to attack each other's acting, and which one is carrying the film.
And, of course, "Hey! A Movie!", the song in the opening scene, about how they're "going to be in a movie starring everybody... and me".
When the newspaper editor harangues the main trio for missing the story, we get a wonderful line that's later called back to in The Muppets:
Newspaper Editor: Next time? Next time?! What makes you think there's going to be a next time?
Kermit: Well, if there isn't, it'll be a very short movie.
Not Even Bothering with the Accent: Played with by London cabbie Beauregard on why he doesn't have an English accent, despite having lived in London "all my life". "English accent? I'm lucky I have a driver's license!"
Nicky also has no trace of a British accent, despite being the (accented) Lady Holiday's brother.
And, in fact, very few of the people the Muppets encounter while in England are actually English.
Obvious Stunt Double: As Ms. Piggy is racing to the gallery on a motorcycle there are several shots of a full body driver on the bike which is obviously a real person. Though they are careful to never show the face, the difference in size between a human and a Muppet is blatantly obvious. (and this is the same film that had some of the most elaborate actual Muppets riding bicycle scenes).
Opt Out: Subverting the usual trope, everybody starts opting out when Kermit proposes his plan to stop Nicky's gang from stealing the Baseball Diamond. All except Gonzo and Fozzie, that is, the latter of whom uses a heck of a guilt trip to get everyone back in.
Trrrilling Rrrs: Lady Holiday, noticeably when talking on the phone about her "horrrrrendous" fashion designs.
Unusually Uninteresting Sight: Nobody in the Happiness Hotel reacts with fear or panic when Beauregard drives his taxi into the hotel. They all just calmy continue what they were doing, only giving a brief glance to the action.
Very False Advertising: The Happiness Hotel. Granted, the people who live there are a very happy bunch, but it's more despite the living conditions than because of them.
By way of example, the travel guide lists it alongside bus terminals and riverbanks in the section labeled "Places you can park your carcass."