>>I love it when Clark winks at the fourth wall like that.
Probably the best reason Ambush Bug came out of Superman and not something else. It would have been funny to have Schwab point the fourth wall out to Supes believing he could see it too. Supes could have denied it, then winked as soon as AB turned his head.
And it also fits in well with Superman Beyond. Supes has ALWAYS been able to see us. (It would explain why the explanations in his thought balloons seem directed at us--look at panel 2)