It's crazy to muck around with timing, When things are quantised to frames you have very little scope for change without it being very noticeable.

There are a heap of image based ways to encode data. Kerning on the credits, Position of titling. Minor brightness colour tweaks.

The thing that springs to mind the most. THERE'S A FULLSCREEN WHITE NOISE EFFECT AT THE START OF THE SHOW. You could stick whatever you want in there.