Sending money via wire transfer requires two numbers: the account number and a routing number (or SWIFT code, for a non-US transaction). The routing number (or SWIFT) determines what bank the money goes to; the account number determines what account the money goes to within that bank. In addition, the system that accomplishes inter-bank wire transfers is not open in the evening, when the play is set.
Multiple police allow people they just heard confessing to murder to return to the murder scene to finish out the remaining hours of the play before (presumably) arresting them. They are risking further contaminating of evidence (as far as law enforcement could know), as well as giving the killers an opportunity to escape through the confusing backstage architecture.