1/ I wish I were there to see Dan's face when they told him the news. or I wish I was there to see Dan's face when they told him the news. - некоторые учебники в условных и подобных предложениях предлагают употреблять "I were".
2/ I wish I had been there to see Dan's face when they told him the news.
Употребление времени (Past Simple или Pasr Perfect) зависит от контекста (предыдущие предложения).
2/ I wish I had been there to see Dan's face when they told him the news.
Употребление времени (Past Simple или Pasr Perfect) зависит от контекста (предыдущие предложения).