There's No Place Like Home - S28-E16
Character mistake: The old photo of Sylvia and her friend shows them in RAF uniform. Sam, who is a serving British Army officer and could be expected to recognise the very obvious differences between the uniforms, keeps referring to Sylvia being in the Army and Sylvia does not disagree with her.
Fenikkusu! Jigoku o mita senshi - S1-E6
Character mistake: When Jabu gets maimed by the Nebula Chain attacking from above, the commentator says "One point for Andromeda Shun." Points? There never were points during the previous fights. (00:11:05)
The Singer - S7-E5
Character mistake: Near the end, Matlock says that he can prove who killed KC. The burden of proof lies with the prosecution; as a defense attorney, Matlock doesn't have to prove anything.