Can the memory-scape affected by the character's state at the time? For example, if Natsuno was sick at the time, can things sway/blur/just feel off?

Basically how messed up can it be, I already decided the death tax is on so his parents will appear like creepy static-y figures

ALSO: what if a visitor steers the memory into a previously unseen territory? Like, what if they convince Natsuno to sneak into the creepy manor he's only ever seen from outside?