Fantastic Fantaseer

something I noticed in Phineus and Ferb. I know it'd dumb but it's bothering me.

so in the time travel episode where they go to the future to get some kind of fuseing tool, first lets go through what happend up to what I noticed.
some day lets say half way through the current summer and they go to the future where future candace sees them and goes back to the first day of thier current summer. she busts them and goes to a horrible future and comes back to stop herself. so good future candace is stopped from causeing a horrible future by the her that did. that her that did dissapears and so good future candace just wants back to her time. she has phineus and Ferb from the first day of the current summer fix the time machine and take her to the future. then first day current summer Phineus says "and to think this all started cause we needed" (that fusion tool.)

if he's from the first day in the current summer and the him that went to get the tool in the future came from about half way through that summer, then he's from before the him that went to the fututre for the tool. he hasn't done that yet and shouldn't know this was all started by him latter going to the future for the tool.

see my point? I've noticed countless such things in numerouse different places. I mean yah future candace could have told him about it, but that was never shown so for the purpose of my point lets asume she didn't and the writters just made a mistake. but anyways from now on I'mma do my best to remember these things when I find them so I can post about them here.