1. Osomatsu-san Lampoons Shingeki no Kyojin
Episode one of the 2015 Osomatsu-san revival featured an onslaught of anime references - and was removed from the Japanese home media release because of it - but the most stand out parody was easily the sextuplets' take on Shingeki no Kyojin.
2. Holo Cutout in Durarara!!
3. Neo Genesis Evangelion-Themed Twister in GJ-bu
4. Mako Swimming in Inou-Battle wa Nichijou-kei no Naka de
With Kill la Kill studio Trigger animating the anime adaptation of Inou-Battle wa Nichijou-kei no Naka de, it was only natural to expect a cameo or two, such as the above picture of Mako Mankanshoku swimming.
5. Kirino, Kyosuke, Ruri, and Saori in Boku wa Tomodachi ga Sukunai
6. Angel Beats! References Studio Ghibli
7. Kyubey Sign in Nisemonogatari
8. Yuyushiki Magazine in Kiniro Mosaic
9. Gundam Models in Keroro Gunsou
10. Goku Visits the World of Dr. Slump
11. Lupin III Homage in FLCL
12. Excel Becomes Sailor Moon
Bishoujo Senshi Sailor Moon is far from the only series parodied in Heppoko Jikken Animation Excel Saga, but this anime reference stands out because the female leads from both series are voiced by Japanese voice actress Kotono Mitsuishi.
13. Naruto Headband in Ansatsu Kyoushitsu
14. The Fridge from Cowboy Bebop Lands in Space Dandy
There's numerous evidence that suggest Cowboy Bebop and Space Dandy take place in the same universe - and both series were directed by Shinichirō Watanabe - but the strongest one was the infamous alien-infested fridge from the former winding up in the latter.
15. Urusei Yatsura Ending Reference in Kill la Kill
The second ending theme for Kill la Kill called "Shinsekai Koukyougaku" is a direct reference to the first opening theme of Urusei Yatsura named "Lum no Love Song."
16. Titan Sandcastle in Nisekoi
Viewers of the harem comedy Nisekoi were treated to a sly Shingeki no Kyojin reference of the monstrous Titan peeping its head out of this sand castle.
17. Kino no Tabi: The Beautiful World Light Novel in Toaru Kagaku no Railgun
18. Gaming References in No Game No Life
19. K-ON Castanet Dance in Watashi ga Motenai no wa Dou Kangaetemo Omaera ga Warui!
The socially inept Kuroki Tomoko from Watashi ga Motenai no wa Dou Kangaetemo Omaera ga Warui! is seen here doing Yui Hirasawa's castanet dance in K-ON!
20. Light Stops By Death Parade
21. Sword Art Online Figurines in Saenai Heroine no Sodatekata
For a series about a high school otaku trying to support his BD buying habits, Saenai Heroine no Sodatekata having anime references like these figurines from Sword Art Online, Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai., and more are expected.
22. Dirty Pair Cameo in City Hunter
23. Haru and Shizuka in Hoozuki no Reitetsu
24. Kamehameha in Blood Lad
25. Anime Posters in Outbreak Company
There's a ton of anime references in the 2013 series Outbreak Company, such as the second episode featuring altered anime posters of Hataraku Maou-sama!, Toaru Kagaku no Railgun, Yondemasu yo, Azazel-san..
26. Shingeki no Kyojin Uniform in Servant X Service
Outfit maker Megumi Chihaya from Servant X Service is seen in the 12th episode with a few of her cosplay creations from series like Shingeki no Kyojin, Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai., Bakemonogatari, and Fate/kaleid liner Prisma Illya.
27. Death Note Reference in Binbougami ga!
The likeness of L, Misa Amane, Light and more from the Shonen Jump thriller Death Note can bee seen in the 2012 comedy Binbougami ga!.
28. Miku Hatsune in Zoku Sayonara Zetsubou Sensei
29. Eva Reference in Paniponi Dash!
The gag anime Paniponi Dash! pays tribute to the iconic Neon Genesis Evangelion scene of Evangelion Unit-01 holding Kaworu Nagisa.
30. D-Frag! Cameo in Kami nomi zo Shiru Sekai: Megami-hen
31. Shin-chan Toy in Sailor Moon
In Bishoujo Senshi Sailor Moon a toy based on Shinnosuke Nohara from Crayon Shin-chan is seen; owned by a boy named Shinnosuke who shares the same troubling characteristics to the character.
32. JoJo no Kimyou na Bouken in Yahari Ore no Seishun Love Comedy wa Machigatteiru. Zoku
Yahari Ore no Seishun Love Comedy wa Machigatteiru. Zoku has Hayama Hayato mimicing Giorno Giovanna's "I have a dream!" pose in JoJo no Kimyou na Bouken.
33. Grand Line Reference in Ore no Kanojo to Osananajimi ga Shuraba Sugiru
34. Gundams in Shirobako
While these blurred out images might be hard to make out, these are indeed Gundams appearing in Shirobako: an anime about the Japanese animation industry .
35. Yuru Yuri References in Sabagebu!
Former Yuru Yuri anime director Masahiko Oota managed to sneak in some subtle and not-so-subtle references to the series in Sabagebu, including the scene where Akari Akaza rolls off a cliff in a drum barell.
36. Light Novels in Haiyore! Nyaruko-san
Haiyore! Nyaruko-san, the romantic comedy based on the H. P. Lovecraft Cthulhu mythos, teased the light novel release of Ore no Kanojo to Osananajimi ga Shuraba Sugiru.
37. Joshiraku Addresses the Anime Industry
The hilarious comedy Joshiraku got very real when it addressed the anime industry's unhealthy fixation on the latest craze, citing the copycats of Neon Genesis Evangelion, K-ON!, Mahou Shoujo Madoka Magica, and Sword Art Online.
38. Yui and Kyon in Chuunibyou demo Koi ga Shitai!
The likeness of Yui Hirasawa from K-ON! and Kyon from Suzumiya Haruhi no Yuuutsu can be seen in Chuunibyou demo Koi ga Shitai!: Kirameki no... Slapstick Noel; all three shows produced by Kyoto Animation.
39. Akira Motorcycle Scene in Michiko to Hatchin
40. Fullmetal Alchemist Reference in Seitokai no Ichizon
41. Lil' Slugger in Psycho-Pass
42. Nice Boat Shout Out in Kimi ga Aruji de Shitsuji ga Ore de
The harem comedy Kimi ga Aruji de Shitsuji ga Ore de referenced the meme-favorite "Nice Boat" scene from School Days, where a gruesome scene in the final episode was edited out with a live action clip of a boat.
43. Mashiro in Danna ga Nani wo Itteiru ka Wakaranai Ken
44. DBZ Parody in Gintama
Anime references are abundant in the action/comedy Gintama, but the series pays special tribute to the popular Shonen Jump series Dragon Ball Z.
45. Rei and Asuka in Tengen Toppa Gurren Lagann
Two girls dressed as Playboy bunnies in Tengen Toppa Gurren Lagann look awfully like Asuka Langley Soryu and Rei Ayanami from Neon Genesis Evangelion.
46. Soul Eater and Fullmetal Alchemist in Barakamon
47. Haruhi Cosplay in Lucky Star
Kyoto Animation made plenty of references to its previous Suzumiya Haruhi no Yuuutsu in Lucky Star, but the most notable was the Haruhi Suzumiya cosplay worn by Konata Izumi.
48. Vegeta and Trunks in Seto no Hanayome
Two students who share a strong resemblance to Vegeta and Trunks from Dragon Ball Z appear in mermaid-inspired romantic series Seto no Hanayome.
49. Akira, Gundam, and more in Abenobashi Mahou Shoutengai
The surreal fantasy parody Abenobashi Mahou Shoutengai made numerous anime references during its 13 episode run, including Gundam, Neon Genesis Evangelion, and Akira.
50. Saint Seiya Transformation in Arakawa Under the Bridge