When Gypsy and Helen are fighting over the teddy bear, Gypsy breaks a table. After the table has broken, the table is standing at a tilt. In the next shot, the table is perfectly straight.
When Reeve is strangling both Gypsy and Helen, Gypsy looks down at the sword she is holding. In the first shot, the sword was different from the sword that Gypsy was holding a few scenes ago. As the shot changes, the sword becomes the same sword that Gypsy was holding earlier.
During the final scene when Gypsy and Helen are fighting Duke Dekotes, Helen gets hit by the Duke's mechanical claw. When Helen falls down, there are three scratches on her stomach. When she stands up, the scratches are gone.