Continuity: In the beginning scene, the ruler of Argos is condemning his daughter and son to the sea with a group of guards present at the shore. While he is giving his speech, there is a brief moment when the whole group can be seen getting drenched by a wave crashing ashore, but in the very next moment of his speech - even up to the daughter's cast off - no one is wet.

Revealing: When Calibos is speaking to Thetis' statue, as he screams "I demand justice", you can see the left horn on his head wiggling around, revealing a flimsy prop.

Continuity: When Perseus is taming Pegasus, a claymation model is used for the long shots of the famous flying horse. However, when it shows Perseus jumping on the back of the real horse, you can clearly see that the horse has no wings. They couldn't figure out a way to strap on fake wings for the close-up?