A little premature
It's established that Twist uses his observation post and buzzer hook up to alert the crew when Lonnegan is about to receive the phony information and a second signal to alert the crew that he's on his way. However when Lonnegan leaves the betting parlor, the crew seems to break character a few seconds after the door closes. It would've made more sense to have Twist give an additional "all's clear" signal when he sees Lonnegan exit out of the alley just in case Lonnegan went back in unexpectedly. For such an elaborate con, not having an "all's clear" signal seemed a little risky.
Jesus is the Son of God and my Lord and savior. Pretty cool.