Ami and Yumi's bikini tops switch from big to small in some scenes.
In "Robo-Pop," Yumi's wristbands reappear and disappear in some scenes.
In this episode, Ami and Yumi sleep in the same room. But in "Collect All 5!", they had separate rooms.
Ami: (shows her tattoo that says "Have a Bad Day!) Check out my ink! Kaz: A tattoo?! That's it! As your manager and dysfunctional father figure, I demand to know what's going on here! Ami: Whoa there, Pops! If you're gonna lay that lame trip on me, I'm checking out a hotel! (leaves the bus and rides back on the stolen motorcycle)
Yumi: Hey buddy! Keep your meathooks off my axe!
Kaz: I recognize the patterns of delinquent. Those are Crazy Styxx's sticks! Yumi: Who's Crazy Styxx's Sticks? Kaz: (annoyed look) Crazy Styxx!
Ami Bot: I AM AMI. I AM VERY EXCITED TO MEET YOU! Yumi Bot: I AM YUMI. I AM TOO COOL TO BE EXCITED.
Yumi: OSAKA! Ami: TOKYO! (The two fight using the two pointers as swords, and the map of Japan falls down) So now you know where we are from, Tokyo and Osaka. Yumi: Osaka is better.
The episode Robo-pop was originaly titled "A Clockwork Puffy."
Main Villain Bios: Crazy Styxx - He was a hard-core rock drummer who deceased in an accident and has left two of his drumsticks. Metal Breath - They are a trio of heavy metal who try to steal Ami and Yumi's spotlight.
Main Villain(s): Crazy Styxx and Metal Breath
This is the first time we see the girls dressed in heavy metal clothes.
Featured Song: Urei
"Metal Mental" was supposed to be called "Metal Madness."
Ending Credits: The Funky-fresh Hydraulics causing all the Puffy-Bots to fall apart, and Kaz reacting to it after they all were destroyed.
Live Puffy Theme: Ami and Yumi tell their hometowns of Tokyo and Osaka and then have an argument about which is better.
Kaz is seen without a shirt for the first time in "Robo-Pop."
We learn that Yumi is from Osaka, while Ami is from Tokyo, which she claims is better than Osaka. It led to a struggle that was continued in the second segment, and ended with Yumi saying "Osaka is better."
Whenever Ami and Yumi get stressed during "Metal Mental," they tend to shout things in Japanese. This is used alot in other episodes.
Featured Songs: K2G (from "Nice"), That's the Way it Is (from "Hi Hi Puffy AmiYumi: Music from the Series"), Urei (from "Nice").
"Metal Mental" is the second time Ami and Yumi are referred to as Puffy. The last time they were referred as that was in the previous episode, Dance-A-Go-Go.
The names of Metal Breath's members are Carnivore, Roadkill, and Scar Tissue. Carnivore is the short one, Roadkill is the tall one, and Scar Tissue is the one that always wears black and talks in a deep voice.
In "Metal Mental," Yumi plays the beginning of a Puffy song, K2G. This song has also been used in a Teen Titans episode, Mad Mod.
This is the first time we see Ami and Yumi in their bikinis. Ami's top has a heart it the entire bikini is blue. Yumi's is a camouflage, but is later changed to one similar to Ami's in Surfs Up.
The pre-title, "Metal Madness", is a reference to Metal Sonic's Metal Madness form In the video game "Sonic Heroes".
Episode Title: Ami Goes Bad It is very similar to the All Grown Up episode titled Bad Kimi.
Ami: Smokin'! This was the trademark phrase from the movie, The Mask.
Episode Title: Robo-Pop A pun on the RoboCop movies, cartoon, and syndicated TV show.
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