Found the following hamletworks.org entries referring to line 2904

View Commentary Note for 2904-05
2904 <A noise within. Let her come in.> 29044.5.153
2905 Enter Ophelia ..
2904 {Laer. Let her come in.} 4.5.153

View Immaterial Textual Note for 2904-05
2904 <A noise within. Let her come in.> 29044.5.153
2905 Enter Ophelia ..
2904 {Laer. Let her come in.} 4.5.153

View Material Textual Note for 2904-05
2904 <A noise within. Let her come in.> 29044.5.153
2905 Enter Ophelia ..
2904 {Laer. Let her come in.} 4.5.153