for example Akhand Hanuman Chalisa Path is reading Hanuman Chalisa continuously for 108 times........
similarly it can be done by reading Ramayan continuosly ... which is called Akhand Ramayan Path........
u also have prayer called Akhand Japa of Om Nama Shivaya... mainly done on Maha Shivrathri........
so Akhand path means non-stop recital of a prayer (hindu/sikh) for specified number of times or for specified time.......
as far as shaving the head is concerned ..... i donno y they showed it in this particular puja.......
shaving head is a south indian tradition ....mainly people offer their hair to Lord Balaji in Tirupathi , when their wishes r fulfilled.......... I have no clue about North Indian shaving off their head......
hope i am clear..... just wanted to share these points.....