The one time I did a twill with tablet weaving I used some nice small horn tablets I'd been given by a friend (I think she got them from one of the on-line re-enactor's merchants). I found this to be very useful, because I scratched little arrows onto the outside edge of the outside card showing which direction the pack needed to turn next (and I always turned the outside ones the same direction). This meant that if I got distracted while weaving I could always look at the edge of that tablet to see which way I needed to turn the cards next.
I don't mark up my tablets for weaving directions; if I mark anything at all, it's a coloured edge for the tablets that show the middle of the pack or some similar important divide, like the edge of a pattern in the band.
I learned how to tablet weave (and how to twill) from Karina Grömer, and she taught me her way of twilling, no counting needed. So getting distracted while doing a simple twill is no problem for me. When I'm in the middle of a pattern in the twill, however... then I need a moment to get back on track.