I think it was part of the plan. It was Eric's birthday. And there is video, a Twitter one where perhaps Don Jr was videoing the tiny birthday party. Apart from the Trump children gathering, Trump is standing away from them. He is holding a red folder. He is very deliberate in his holding it, and moving. Looking directly at the camera.

That was before his boring speech. During the very, very long wait---another thing Trump does not do--leave ppl hanging with a very, very long wait.