I made one minor, dramatic improvisation, while being Smith, which might be worth working into future iterations of the game - the ability to remove (and re-wear) your mask at will, during your slot, provided that nobody sees you doing it. There were a couple of times when a large group of pursuers were about to catch me; the first time I just ended up giving all my ribbons out at once, but the second time I saw it about to happen, I ducked around a corner and removed my mask, so that I could "teleport" to a safer location a couple of minutes later. Warning players that large crowds will spook Mr Smith might be a good way to break up the snowballing and fun-sapping "follow other players and stay right behind them" strategy.
It's actually quite amusing how blankly your pursuers look through you, when you're out of the mask.
Great to play this at the Barbican last night. The addition of the "Bad Smith" seemed to sharpen the game up nicely - in the first playtest we had to double-up the actors, and had a few players optimistically trailing people to see if they'd change back into Smith. The threat of that actor maybe turning into Bad Smith seemed to be enough to stop this.
Last night's game had a Bad Smith turning up for five minutes, about a third of the way into the game, which seemed to be enough to make people jumpy. It might be interesting to try having two Smiths running constantly throughout the game, one good and one bad.