Teen Titans (2003)

Deception - S3-E1

Continuity mistake: When Cyborg first comes into the H.I.V.E. eating hall, we can see several students sitting dispersed among the tables, among them See-More (the guy with the cyclopian helmet) and Kyd Wykkyd (the Batman-type kid). At first the two of them sit at separate tables; but when Cyborg sits down and Jinx, Gizmo and Mammoth confront him, we can see the two sitting shoulder by shoulder at the same table.

Deception - S3-E1

Continuity mistake: Mammoth overpowers Starfire and slams her into the ground. First we see her lying in an indentation in the ground in the same shape as herself, but when Robin lands near her soon afterwards, she is lying on level ground, and the indentation has disappeared.