Frankie Muniz recalls his early experiences filming 'Malcolm in the Middle' to PEOPLE, joking that Bryan Cranston was cast as his father only hours before filming began, and that he appeared on the set in 'a Speedo.'
From what I've heard, it was more like: Because everything was shot out of order, he didn't retain it like you would if you watched it. Kinda like, do you remember every day of your first job? There's an interview/podcast with him explaining it more.