Found the following hamletworks.org entries referring to line 689

View Commentary Note for 689
689 Ghost. Pitty me not, but lend thy serious hearing {D2v}  

View Immaterial Textual Note for 689
689 Ghost. Pitty me not, but lend thy serious hearing {D2v}  

View Material Textual Note for 689
689 Ghost. Pitty me not, but lend thy serious hearing {D2v}