Continuity mistake: Hercules meets Phil. Phil walks away & enters his tree. Hercules grabs the door & yanks it off it's hinges. You can see there's a hinge on the door & another was left in the doorway's frame. Phil is hanging onto the door handle as Herc holds it up. After Phil lets go of the door, the door has both hinges.
Continuity mistake: The size of the Titans constantly changes throughout the scenes involving them. This is particularly true for the Rock Titan.
Continuity mistake: When Hades throws the steak to Cerberus, the size and shape of the steak changes noticeably between shots.
Continuity mistake: When the blonde kid takes the Frisbee away, saying "Nice catch Jerkules", the yellow circle that was in the middle of the circle earlier is gone.
Continuity mistake: After Zeus tells a joke, he falls into his chair saying, "I kill myself," but his lips don't match what he's saying.