Shinkyoku Soukai Polyphonica

Anime that suffer from a considerable drop in animation quality in at least one episode. This can vary from weird looking faces to changing animation technique, using cutouts to make up or making an episode with basically no animation.

I looked in TVtropes, CBR and AniDB for some of these.

If you know of another case, feel free to tell me!

Note
It must NOT be done on purpose, like FLCL, (most of) Shaft's anime or Masaaki Yuasa/Studio SARU anime
It will count here even if the errors were fixed in physical releases.

Anime that I want to go over again with a fine tooth comb and new eyes

𝐏𝐚𝐫𝐭𝐬
This is part 3 of the ultimate music anime stack! I recommend reading the description in part 1. Part 2 is all about classic idol anime. This part contains titles that deal with music in various degrees, but also have something that deviates from regular musicianship — basically it's anime that do not fit in part 1 or 2.
Part 1 ➢ https://myanimelist.net/stacks/58200
Part 2 ➢ https://myanimelist.net/stacks/62820

The first half of part 3 features singers, music listening, karaoke, musicals, and school life, and is ordered roughly by score. The second half features sci-fi battles, dancers, and dance-related professions.

𝐒𝐨𝐫𝐭𝐢𝐧𝐠
1–8. Movies
9–24. Series
25–36. Sci-fi*
37–44. Dance Anime
45–50. Other movement art, like figure skating and cheerleading

*Sub-sorted into Macross, action, and other (containing 4 titles each)

𝐓𝐇𝐀𝐍𝐊 𝐘𝐎𝐔 𝐟𝐨𝐫 𝐫𝐞𝐚𝐝𝐢𝐧𝐠 𝐦𝐲 𝐥𝐢𝐬𝐭𝐬!

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𝘐𝘴 𝘢𝘯𝘺𝘵𝘩𝘪𝘯𝘨 𝘮𝘪𝘴𝘴𝘪𝘯𝘨? 𝘈𝘯𝘺 𝘦𝘳𝘳𝘰𝘳𝘴? 𝘗𝘭𝘦𝘢𝘴𝘦 𝘤𝘰𝘯𝘵𝘢𝘤𝘵 𝘮𝘦.