Found the following hamletworks.org entries referring to line 2381

View Commentary Note for 2381+1
2381+1 {Enter Hamlet.} 

View Material Textual Note for 2381+1
2381+1 {Enter Hamlet.} 

View Commentary Note for 2381
2381 <Ham. within. Mother, mother, mother.>..

View Immaterial Textual Note for 2381
2381 <Ham. within. Mother, mother, mother.>..

View Material Textual Note for 2381
2381 <Ham. within. Mother, mother, mother.>..