Hi Joanne
Really glad to hear that your Dad is steadily improving. Your Dads weird moments could just be overload sometimes if there is too much noise, stimulation the brain can go into overload and just cuts out for a while.
I know I used to do it frequently early on in my recovery and still do from time to time when overtired. My husband and daughters just call them my spaced out moments (lights on but no-one at home).
Hope that you are now taking time to rest a bit more and look after yourself.
Janet x