Found the following hamletworks.org entries referring to line 456
View Commentary Note for 421
421
Ham. Arm'd say you?
1.2.226
View Commentary Note for 444
444
Ham. If it assume my noble fathers person,
1.2.243
View Commentary Note for 456
456
My fathers spirit (in armes) all is not well,
1.2.254
View Immaterial Textual Note for 456
456
My fathers spirit (in armes) all is not well,
1.2.254
View Material Textual Note for 456
456
My fathers spirit (in armes) all is not well,
1.2.254