When Hercules rescues Cassiopea from the pit, Ariadne appears in the entrance, spear in hand. Herc throws his sword and she falls dead in the doorway. In the next scene as Herc and Cassiopea are leaving, they walk right through the area where Ariadne fell but her body is gone. The following scene is a closeup of Ariadne's body quickly decomposing and disappearing.
When Hercules throws the rock tied to the rope out into space, you can see a wire hooked to the rock as it pulls it out into space.
When the serpents attack baby Hercules, the long shot with showing the baby and his hands, but the close up shot clearly shows and adults hands killing them.