When Serena and Amy visit the clock store, one of the clocks is a little castle with mini Serena and Darien figures dressed as royalty.
When Negatime is aging Serena back to her 14 year old self, the shot shows Serena being taller than Amy, however when it shows them both walking out of the building, Amy is taller than Serena.
(Sailor Moon is having a vision of herself as an old lady) Sailor Moon: I am Sailor Moon, Grandmother of justice!
Robocop
When Amy uses her mini-computer in order to find where the demon is, its screen displays the following directives: Serve the Public Trust, Protect the Innocent and Uphold the Law. Those directives are the same prime directives that the character of Robocop is programmed with.
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