Kiddy Grade[]
Episode 08[]
During broadcast the Episode 8 title card was misspelt (this was corrected for home video)
Episode 09[]
Tweedledum's hair.
Shortly after Tweedledum destroyed a robot and Tweedledee scolded him for calling her sister while on assignment, Tweedledum jerks his head up. During that his right hair bang disappears partly into his neck shortly.
Episode 12[]
Lumiere's eyes[]
During a running scene, Lumiere was animated closer to the screen than Éclair. As she is running, her eyes start to switch from purple to amber, which is an animation error.
Episode 17[]
The banner at the reopening ceremony was misspelt as "Galactic Organizatoin of Trade and Tariffs" during the orignal broadcast (corrected for home video).
Interlink[]
During Kiddy Girl-AND's run, there were numerous mistakes that did not mach the timeline of Kiddy Grade.
Eclipse's death
In Episode 18, Q-feuille learns more about the past of the GTO and learns about Eclipse, the former Head of the GOTT. She looks at an opened page on the screen, where it says "To Heaven: SC.0322".
However, this date is before the start of the Kiddy Grade series (set in SC.0328) and so it is impossible that Eclipse died at that time.