When he is talking on the monitor to Galaxy Garrison, a shot from behind Prince Bandor shows him with green hair, but when they show him from the front, he's back to having brown hair.
When Hunk says, "What a shot!" his visor is missing.
During the battle, they cut to split screens of Keith talking to Allura, but Keith is shown with the Red Lion instead of the Black Lion.
The narration says Allura and Romelle spent time together as children, but they didn't meet until the events in "My Brother is a Robeasst".
Alfor was shown wearing body armor in his tomb in "A Ghost and Four Keys", but here his body is shown uncovered.
The Alliance representative who first meets the Muses changes twice. First his red hair turns brown, then his uniform switches from brown to gray.