Found the following hamletworks.org entries referring to line 1

View Commentary Note for 1
The Tragedie of 0{B1r} <nn4v>
H A M L E T
Prince of Denmarke.
1 <Actus Primus. Scœna Prima.> 1.1 

View Commentary Note for 97
97 At least the whisper goes so; our last King,1.1.80