Episode 1: How to beat Brady Culture (I could've sworn I tried all combinations of commands, but I finally looked it up).
Episode 4: The Army poster--Much too blended in.
Episode 6: Didn't put two and two together and know to make Leonard Vomit. And using the spoon bending to open the door to Hugh Bliss's lair--I could've sworn I needed Bosco's earthquake machine to shake the bowling ball, but you can't get that until after you get in, I realized.
Season 2, 2 games in so far, haven't needed even the in-game clues.