The actors inside those cossies couldn't see a think. Unless they re-jigged them, it must have been as scary for those por chaps as it was for any kids seeing them.
Apart from that - I'd have been over the moon to see them wandering around the street - they are wonderful.
As a kid, I was walking home from the shops and the Batmobile drove past - it was the 60's when the TV show was still "new". I was completely blown-away - I can still picture it clearly over 40 years later. I'll bet there were kids who saw that Silence in the street who'll be talking about it 40 years from now.