The four I mentioned were Martial at the end of last season, the Serbia one he got away with, the Spurs goal and yesterday. I'd agree that the Spurs one was the least poor but poor nonetheless and the other three were pretty terrible being honest. He wasn't great for the Dutch equaliser in the friendly either (more so Duffy obviously) and I thought he probably should have done better for Witsel's header at the Euros.
It was Paul that mentioned inconsistency, I think he's pretty consistent is a lot of ways but seems to have regular enough mistakes in him. Even if you don't agree with the Netherlands/Belgium ones I still think the other four are incriminating enough over a relatively short period in terms of game time. That's in no way taking away from the brilliant saves he's made, the ones from Mkhitaryan and Henderson were truly world class.