There is making out in the back seat... that's when Maddy finds them, actually.

and I think we agreed that they could bond over Jonathan's lack of driving skills or something.

Well, they have this very loaded conversation that's (on the surface) about the mystery-that-isn't and James takes Jonathan off in an Alfa, (backseats for the making out in) to try and change his mind about cars, so I think that counts?