I'm still on fake-pietro ass : I noticed a few more sketchy things after re-watching this episode with my sister.
His dead form, with the bullet wounds do not match the one of the real pietro contrary to vision dead body. Of course she wasn't here but still the show pays attention to recreate a ton of things. His dead form also appear when she seems doubting that was she is doing is wrong, like a distraction.
Moreover before being owned by Wanda, he pointed that her dead husband can't die twice...but he did.
He clearly invented that halloween story when they were kids.
Seems like someone who know Wanda's story but not the details.
Also I noticed that Agnes was in the opening, confirming her as one of the main cast of the "show" but not giving her a last name which is once again suspect.