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Erin Carufel portrays Yvonne Craig/Barbara Gordon/Batgirl as a red head although on the series the character of Barbara Gordon was a brunette who wore a red wig as Batgirl.
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When Minerva visits Freddy The Fence, she tries to close the door behind her but it clearly doesn't stay closed. When the shot changes a few seconds later, the door can be seen behind her and is closed.
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In Minerva, Mayhem and Millionaires, executive producer William Dozier and producer Howie Horwitz had uncredited roles as customers of Minerva, who asked Horwitz how he became a rich television producer. Horwitz replied "by never hiring method actors and never listening to network executives."
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When Dr. Cassandra is initially handling the Alvino Ray Gun, she holds it backwards, but by the time she comes to use it on Batman, Robin and Batgirl she is using it the correct way!
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Catwoman is featured in this episode as she appeared played by Julie Newmar in the first two seasons rather than as Eartha Kitt from this third season.
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King Tut appears as one of the 'arch-villains' of Gotham City, even though in a previous (two weeks before) episode 'I'll Be A Mummy's Uncle' King Tut returned to his life as a professor of Egyptology after a blow to his head that completely reformed him.
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In the Bat-fight, you can clearly see one of the Joker's henchman waiting to be 'thrown' out of the flying saucer!
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King Tut is permenantly cured at the end of this episode.
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This is the second and final time Batman and Robin fight the bad guys in the bat cave.
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At the end of this episode, the preview for the next episode Joker's Flying Saucer, we see Joker's flying saucer but in the episode, he was just building his saucer.
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Batman and Shame's fight goes down on a re-dress of the Mayberry set from The Andy Griffith Show.
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This was the only adventure where no words or animated signs was used.
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Correction to the above message: the trap Joker is referring to is from near the end of Part 1 where his lethal Joker buzzer robbed them of their five senses one by one until Batgirl revived them with Batgirl antidote pills. Yet at the beginning of this episode, they must've seen the Batmobile drive off but were waiting to get Batgirl as well with the Cat Whiskers trap.
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The Trap that The Caped Crusader and The Boy Wonder were supposed to be placed in was cut from the story, but later in this segment The Joker is surprised when The Dynamic Duo and Batgirl appear at the lighthouse, when he believed them all to be dead! When it was decided to delete the trap sequence, nobody took notice of the goof in The Joker's dialogue!
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Goof: In the beginning of the episode, Alfred says "excellent, Master Robin" while Dick Grayson is out of "uniform" playing the drums.
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In the kidnap scene,when Skip Parker leaves Barbra Gordon and arrives at the Hang Five he is barefoot. Yet when the Joker and his crew are carrying Skip Parker from the Hang Five to Joker's car, he is wear a pair of white sneakers (plimsolls) and is no longer barefoot. The sneakers look to be white canvas slip-on and he's not wearing socks.
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In the scene were the villians are running from Batman and Robin, Joker's henchman were barefoot but when they ran into the building, they suddenly had shoes on and socks could be clearly seen also.
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The dinosaur costume was a left over from "The Questing Beast" episode of the Sixties TV-Series Lost in Space.
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Bruce Wayne was restored to normal by listening Siren's "antidote note". Gordon and O'Hara do not receive such a treatment (and they couldn't possibly get it, even off-screen), but they are still completely fine and cured by the end of the episode.
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It's interesting that Commissioner Gordon, Chief O'hara, Bruce and Dick are in Barbara's apartment next door to where she is being held. Yet they do not hear the gun shots that the thugs make when demonstrating what will happen to the Commissioner if Barbara does not marry the Penguin!