Teen Titans (2003)

Masks - S1-E9

Continuity mistake: When the Titans discuss Robin's self-isolating behaviour after their second encounter with Red X, the blips on the map screen behind Cyborg, Raven and Beast Boy all disappear in one shot and reappear again later.

Cyborg the Barbarian - S4-E5

Raven: Evil beware. We have waffles.

X - S3-E2

Trivia: The warehouse in which the Titans combat the new Red X is actually the same warehouse which housed the disco party in "Sisters", right down to the SOTO (after series co-director Alex Soto) neon sign.