1. The N is not characteristic (even against examples 30 years ago) - far too high on the 2nd upright.
2. A pause...for thought as to the next move?
3. In /90s2000's Neil's autograph was wider on the "feet" of the N - even when rushed
4. Uncharacteristic L - doesnt look right, it looks to high next to the linking Y. Also i believe if he had time to do such an ornate flourish at the end, he would have split the Neil and the Young up
5. Whoooah - this would be a unique finish.
Someone correct me if I have got this wrong but I wouldn't touch it - it would have to be one of the largest signatures he has ever done too...