No; I think I can answer this one.
We are constantly trying to make flying safer.
One of the good ideas that I came across in my long career was the use of landing/taxi lights to help us remember if we had take-off/landing clearance or not.
The way it works is this:
PNF: On receipt of T/O clearance, puts the Taxi Lights to Take Off. This can be a reminder/confirmation that take-off clearance has been given to the other pilot.
PNF: On finals, put the Taxi Lights to Take Off when landing clearance has been given (except when LVPs are in force).
My guess is that the FR captain was using such a system and that was why he was able to apologise when he realised that the lights were still to Taxi as he taxied in.