Sgt. Frog (TV)

Because Keroro Gunso is a Sunrise title, don't be surprised to see numerous Gundam cameos and references in the series.

The shopping trolley and shopping bag in the OP sequence say "Sunset" on it - a modification of the animation studio's name, "Sunrise".

In the episode that Dororo first appears (episode 13), the part where they are passing the energy ball, Dororo mentions about left hand; this is a reference to Slam Dunk. 

At the very beginning of episode 9, the 'sound only' thing that Keroro uses to talk to Tamama and Moa is a reference to Evangelion. 

Variable: In the original manga chapter for episode 71, Keroro begins the chapter by enjoying the Game Boy Advance SP, however, in the anime, he's playing the Nintendo DS. Technology is advancing quicker than the Keroro Platoon is! 

The twelfth ending to the series, "KERO Neko no TANGO," is a parody of a song originally sung by the singer (Osamu Minagawa) in 1969, titled "Kuro NEKO no TANGO."

The First Part of Episode 295 is a direct reference to the Tokusatsu series Kamen Rider W due to the title as well as it's themes. It also referenced the Early Super Sentai Series. KeroGiro form's attack is also a reference to GouRyuJin's Burning Hurricane Attack from King of Braves Gaogaigar. 

Tamama's main attack, coined the crazy breath, could be a nod to pokemon since it looks just like a hyper beam, including the way it charges up. 

ADV Films paid $408,000 to license the first 51 episodes in 2006, but the series never saw a DVD release before the license was transferred to FUNimation in 2008.

The English title in episode 1, "Meet the Sergeant!" is parodied from that of the news program Meet the Press.

In episode 7, Moa was late 5 years (this episode aired at 2004) to destroy the earth, but the original manga for this episode came out at 1999, and so in the manga she was actually not late.

In episode 13, the part where they are passing the energy ball, Dororo mentions about left hand; this is a reference to the "Slam Dunk" anime series.

In episode 24 Space Detective 556 is actually a spoof of Space Sheriff Gavan and uses the exact same transformation pose. and Lavie is a spoof of the character Annie from Space Sheriff Shaider.

In episode 29, when Keroro drops his mangazine, you can see skewed versions of himself, Sumomo and Giroro on the cover. The manga is called Admiral Geroro. Admiral Geroro manga is produced by Hinata Aki's company.

In episode 38, Natsumi is outfitted with armor that is reminicent to the bootleg Dangale that Keroro tries to win in episode 18. (look at the shield and the sword that is pulled from the head piece)

In episode 43, Kururu invents a gun that turns Natsumi into a demon/goblin/ogre (depending on what translation you go with), but it turns out her transformation was actually into a thunder god. In the original manga, Ch. 31, she was turned into a parody of Lum, from Uresei Yatsura, including saying "Darling" after every sentence.

In episode 58, during the meeting in the first half, Kururu is drinking a Dr. Bebber, parody of Dr. Pepper.

In episode 68, the layout of Natsumi's redesigned room resembles that of Lady Clarisse's from Lupin the 3rd: The Castle of Cagliostro.

In episode 69, much of the first half is a direct reference to Spirited Away, including the episode's title.

In the original manga chapter that inspired the plot in episode 71, Keroro begins the chapter by enjoying the Game Boy Advance SP, however, in the anime, he's playing the Nintendo DS. The current Nintendo handheld console at the time.

In episode 144, two of the transfer students are references to the Di Gi Charat anime. Puchiko Mine is a reference to Di Gi Charat's Puchiko, and her hair style and cat ears also reflect this. In addition, Kyoko Hikami plays the rabbit-eared Hikari Usanda, a parody of Rabi~en~Rose AKA Hikaru Usada. Hikami also plays Rabi~en~Rose in the Di Gi Charat anime.

In episode 146, Keroro and his friends are trying to make people not forget the (former) planet Pluto. Mois is dressed in a costume very similar to Sailor Moon's Sailor Pluto at the rally. In addition, Kae Araki voices the Pluto resident Mei Kujō, the same voice actress who voiced Chibiusa (Small Lady) in the Sailor Moon anime. In the original anime, the two characters were deeply connected.

In episode 169, Keroro parodies the opening to the show "Kamen Rider Den-O."

In episode 190, Giroro yells, "THIS IS SPARTA!" when attacking Viper. "This is Sparta" is a line from the movie "300" and became an Internet meme; additionally, Giroro's voice actor said this line in the Japanese dub of "300."

The first part in episode 295 is a direct reference to the Tokusatsu series "Kamen Rider W" due to the title as well as it's themes. It also referenced the Early Super Sentai Series. KeroGiro form's attack is also a reference to GouRyuJin's Burning Hurricane Attack from King of Braves Gaogaigar.

In episode 298 2nd part, the story is about Saburo traveling to different dimensions, at the end of the episode he is shown holding a white feather, a reference to Tsubasa: RESERVoir CHRoNiCLE.