Funny you should say that. Whenever my father and I attend a game we discuss what's happening in Portuguese which often results in the people standing/sitting next to us to glance at us with puzzled expressions, amusingly it happened twice on Saturday.It's not just that. The crowd there Saturday just didn't feel like a normal footy crowd. There's no way of proving it but just felt like many hadn't been to a lot of footy. There'll be adults who maybe haven't follow the in the past who are now getting interested (maybe through their kids) and once the men start they'll follow the crow boys as well.
My guess is that despite all the work the AFL has done in trying to encourage interest from migrants it's still unusual to hear foreign languages spoken at games, unless we're talking about Port pretending to be Chinese. So these people probably assume that we're new to Australia and the sport, when that's far from the truth.
Besides, when you think about it, you'd have to be passionate about the sport and the club to stand there for the whole game in the rain without an umbrella.