Why all the name calling? We seem to be more or less in agreement.
1) You can't log P2 in a single pilot aircraft like a C152.
2) You CAN write anything you like in your logbook for your own benefit, as a reminder of the flight or whatever. I do it regularly when a friend is P1, plus putting in photos, and writing stuff in the comments column. You just can't write anything in the P1 or P UT column when you do that, or count it towards your flying hours.
3) Mistakes in logbooks are usually seen as just that - mistakes. No-one gets too upset - they just don't count them.
And that, really, is about all I can think of on the subject.