Kiseki no fukkatsu! Yuyo no cosmo - S1-E5
Plot hole: Miho is watching the match at home, and it is day - the kids in the previous episode also entered the Dome when it was afternoon, and a clock at their place when they watched the first of Seiya's fights showed it was 4 pm. Yet she takes a taxi for the arena when it's dark outside.
Cygnus! Hyogen no senshi - S1-E3
Audio problem: To satisfy his weird mother fetish, Hyoga dives with a rose in his mouth, but that does not prevent him from shouting his battle cry. (00:07:00)
Kiseki no fukkatsu! Yuyo no cosmo - S1-E5
Trivia: When Seiya falls down during the victory celebration and the three kids scream (the shot that comes before the one where Miho drops the picture) you can see briefly in the audience between the kids an easter egg appearance of Magical Princess Minky Momo, a character from a different anime. (00:13:50)