In the 'locking down to prepare for battle' montage, Will tilts back the head on a bust of Shakespeare to hit a button that closes a door. This is straight from the 1960s TV show Batman.
Kate Freelander is seen reading a paperback book titled "Gone With the Trash: A Comic Space Opera". This book exists as a downloadable e-book but evidently has never been published in a paper-and-ink form.