Continuity

After Poison Dagger kills Lady Gemini, Master Gemini lays her flat on her back, and her left arm is clearly laid above her head, but in the shot where she is holding Master Gemini's hand, she's rolled over slightly, and her arm is down.

Continuity

As Jack Knife walks across his room he puts on his glasses, just before he reaches the door his glasses fall off. When he opens the door to Madame Blossom his glasses are on his face again.

Continuity

Poison Dagger jumps out the water in the bath, with his hair dry.

Anachronisms

In the beginning of the film a few modern buildings can be seen in the horizon.