Punching Patrick raises his suspicion level by a lot, and pretty much guarantees he catches you. As does him finding you in the rooms upstairs when you try to hide, or talking about how great your dad is at dinner. I think bringing Sage helps a bit, so it come be possible to do a DIK run and still punch him. But I can't remember the exact score.
It's a similar case with Rusty's car; if it gets sold, you don't get the car scene with Quinn, or whether the MC can either respond that he would have come with her or not; Quinn will remember either choice. Which may imply in the future you'll be able to influence Quinn in some fashion, though I don't know if any points are awarded. (Which is a good way to do it, as DPC doesn't like people playing with mods or editors.)
Not sure if it also impacts the Sage date as well, as that also involves Rusty's car.