This was the line from Collins' wife which troubled Cal at the end of the movie, and caused him to "hold the story" and go and talk to Collins again. However I still don't understand how Collins' wife found out this information.
I presume the likelihood is that Robert Bingham found out about the $24,000 figure, and told Collins, who then told his wife? A large hole in the plot, unless I'm missing something?
Collins knew about the $26,000 earlier (from his own investigator), and when he was telling confessing to his wife about the whole story, he told her about it too.
Something like that need not be directly addressed in the film in order to avoid a plot hole. It was of course the case that Collins knew. That he would have told his wife is plausible and even likely. And of course how else would she have known?
In fact there was not a single evidence in the movie that Collins knew about the salary. We can only make guesses whether (and how) he had found this information...
Lets say Collins learns about Sonia spying on his committee, also about the 26k/mnth from PointCorp (assuming from Bingham himself), that he'll continue to keep her on job to conduct his own counter-espionage or whatever,and tells his wife all this over pillow talk,dinner,whatever, and adds that he has his 'sources' without mentioning he knows all this from an army friend he hired to do recon on her.
(btw, hire an ex army,spec ops guy to spy on a mistress? Bingham hated entities like pointcorp and did not work for pointcorp, how can pointcorp higherup profile bingham for Cal? Or did he actualy work for them to pay the bills as smalltime security jobs through fred summers dried up after his death, but hated the experience? Or was he colins' 'field agent' within pointcorp?)
Anyway, so... Collins keeps her on the job, continues to see her because he is in love with her and also in order to 'break her' in pursuit of his own counter-espionage thing on PointCorp through her, not knowing that she had ceased her own spying activities. Then Sonia is killed, collins genuinely tears up at the hearing announcing her death(and also when viewing the Dominic Foy tape),the 'congressman-mistress'can of worms opens up, Anne just finds out about this, calls/meets/visits Cal for pep talk, rejuvinating a fossilized affair,how-to-handle-press advice,whatevr; collins learns later that bingham did it, does not want people tying bingham to him, and afraid that he might be accessory to murder,obstructing justice(not reporting to police about hiring bingham before sh*t hit the fan),recklessly endangering public safety(other murders),etc, he keeps quiet and goes along with Cal's Pointcorp conspiracy theory given collins' incentives to do just that.
the aforementioned take on the movie is one where Collins doesnt order bingham to kill Sonia or tie up any loose ends, is not pretending to be in love with her,is not faking tears at the hearing so as to kickstart his grand airtight cover up/alibi, is not taking advantage of Cal's guilt(for screwing his wife) and manipulating him into creating the coverup for him through his investigative reporting on a supposed PointCorp conspiracy;
Now to the point- Whatever maybe the case,why doesnt Anne ever mention to Cal about her husband knowing about Sonia being paid by PointCorp to spy on him, whenever she talks to him before the "I'm just a source" scene?
Collins knew from the start. The whole press exercise was damage limitation: as crowe acknowledged, he himself was being used by collins to save his political career. Once the affair was common knowledge Collins opened up to his wife, the information that his mistress was being paid would only work in his favour with his wife!
This is a distortion of the events in the serial - there, it's Collins who lets slip about how much Sonia was paid when he's had too much to drink - Cal picks up on it, because he knows from Foy how much was involved, but he hasn't told Collins and neither has anyone else. In other words, Collins is much directly implicated than in the film, where a possible scenario from the comment is that Anne is involved, either with or without her husband.