In your opinion, when did Colm say anything that was interesting not associated with the plot that you would want to have a long conversation about? That was the whole point that Colm will talk about things that don't matter. When Colm was drunk and talking about nice vs memorable, that was the time he said something that made people think and create an interesting discussion.

The cop at least might be talking about his job or raising his son (though we know how that ended).

Edit: I mixed the two up.