Hmm maybe~ Maybe not xD Im wondering why he doesnt tell himself of the past to keep a diary so every time the timeline changes he will know what he did~
But he doesnt remember what happened in other time lines where the world changes to so maybe if he had a diary he could read it whenever he changes something and see what effects there are~
I'm pretty sure he retains the memories that he made during his current time in other time lines.
When he transfers to another time line he doesn't have a memory of what happens after he teleports. His past memories have all have the same origin but with slight changes there and then because of interference.
Yes so thats why if there was a diary of sorts then he may know the small changes due to their meddling xD But i suppose its all quite simple to get... except for when he let ferris send that message...