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If a memory is a magical concept that can be altered, removed, planted and stored, then it is not confined to that which is directly in the subjects sight-line, rather an imprint of the subjects perception in that given time. It would seem the one visiting the memory cannot perceive more than the subject, for example a conversation the subject was too far away to hear or a room he never entered.
Altering, removing, planting and storing are all examples of various processes that can be performed on an already existing memory. The memory itself can only be what the subject remembers, however [see any dictionary definition of “memory”].
It is clear that the visitor is constrained to the boundaries of the subject.
“Harry looked anxiously behind him again. Snape remained close by, still buried in his exam questions – but this was Snape’s memory and Harry was sure that if Snape chose to wander off in a different direction once outside in the grounds, he, Harry, would not be able to follow James any further.”
However, the incredible detail of conversation between the 4 marauders, and especially after “Snape was on his feet again, and was stowing the OWL paper in his bag. As he left the shadows of the bushes and set off across the grass, Sirius and James stood up. Lupin and Wormtail remained sitting: Lupin still staring down at his book, though his eyes were not moving and a faint frown line had appeared between his eyebrows; Wormtail was looking from Sirius and James to Snape with a look of avid anticipation on his face.” – it seems that there is far too much detail for Harry to notice that Snape clearly couldn’t have known or seen then.