It's a great movie. It's not too early to say so about A Prairie Home Companion, because, as a coda to an inspiring career, it effortlessly incorporated into its scenes all a dedicated man had ever learned in life.
I admit something similar to what Ebert reveals in his opening paragraph, there: When I think of the diner scene at the end, with Tomlin, Keillor, Streep and Kline, I see Altman sitting next to them. I attribute their lines to him. It's how I remember the scene.