Both clones included a DNA sequence that allow a fluorescent protein expressed in the cell to bind to cyclin D1 RNA the moment it is transcribed.

This was on set, after the screenplay had already been revised several times, and every moment of that sequence gets rehashed and debated until it’s (arguably) perfect.

But the page turn moment still features a bizarre, black-white-black flashing sequence — a nonnegotiable characteristic of E Ink.