So did you spot them? The McLaren wing-tip vortices?
If you watch the train of cars streaming down the pit-straight at the end of both the first lap, and particularly at the end of the second lap, you'll see that the McLaren of Lewis Hamilton was generating visible rear-wing vortices. Neither the following Red Bulls, nor the Ferraris, nor the Mercedes, were doing so.
What's the reason for this? Is the McLaren rear-wing simply more powerful? Well, McLaren have been running a rear-wing this year with a larger flap than Red Bull, and although this gives Red Bull a DRS-advantage in qualifying, the flip-side is that McLaren have been equipped with a more powerful rear wing in the races. Ferrari, similarly, adopted the Red Bull solution at Silverstone. McLaren experimented with a small-flap design at Silverstone, without success, and seemed to be having similar difficulties at the Nurburgring during Friday practice.
If McLaren do still have a more powerful rear wing, it would provide a simple explanation for how they were able to switch the tyres on in the cold conditions of the Nurburgring, and provide Lewis Hamilton with a car in which he could do his stuff again. McLaren, however, might now struggle with overheating rear tyres in the mid-Summer heat of Hungary, much as they did at Valencia.
And wasn't that the fourth successive race in which Ron Dennis has been in attendance...?