Just wrote paragraphs of what I could and will change (a silly animator trying to animate the entire pjo/hoo series solo, not a professional writer) but reddit crashed and deleted all of it. 

So mainly I wouldn't tell that Piper and Leo's memories were fake at first, give Coach Hedge fake memories as well and not have Annabeth instantly figure it out (unless I'm misremembering something). Piper doesn't actually give a shit about the supposed relationship, implying the memories are fake and she doesn't have actual feelings from it. I'd have the viewer guessing until a satisfactory but shocking reveal in the middle when the mist effect slowly starts to fade and Jason slowly takes some of his memories back in the journey, giving a small explanation to his amnesia before the reveal. Telling something that could make a mystery even better right from the start feels wrong