Found the following hamletworks.org entries referring to line 53

View Commentary Note for 51-52
51 {Enter Ghost.}1.1.40
51-52 Mar. Peace, breake thee of, <Enter the Ghost.> | looke where it comes againe.

View Commentary Note for 53
53 Bar. In the same figure like the King thats dead.1.1.41

View Immaterial Textual Note for 53
53 Bar. In the same figure like the King thats dead.1.1.41

View Material Textual Note for 53
53 Bar. In the same figure like the King thats dead.1.1.41