For me, the funniest bit in the trailer was easily when Ben Bailey Smith’s rapper Dom comes in and talks about Brent’s insistence on making his rap lyrics about little people.
The joke is always on him, but he’s just unsympathetic enough to make those moments work, and it all rolls off of his back anyway, no matter how severe.
It’s very clear in just those two minutes that Brent is the only one who thinks everything is running smoothly, which is part of why the character works so well.
Smith is both a comedian and a rapper (who goes by the name Doc Brown), so he’s a natural for the role of Dom, who hooks up with Foregone Conclusion as a way to develop his name.