I don't think Jim & Andy is a great film. I wouldn't call it must see. I do want to mention a few things that stood out to me. In talking about the early days of his career, Jim Carrey says he woke up one night with this thought: "People want to be free of concern." And when that came to him, that drove his choices about how he would act and entertain. I think that's an interesting statement and observation about people wanting to be free of concern.
Another thought: at times, Carrey rambles on with philosophical thoughts, and some of them are intriguing. A lot of what he says reminds me of the social construction of reality. He seems fascinated by the ability to blur reality. Much of the film is about how reality became confused when he "became" Andy Kaufman for the film Man on the Moon. He also reminds me of a provocateur who likes to mess with people.
It seems like a lifetime ago when he was part of In Living Color. It's interesting to see the flashback. It also seems like a lifetime ago when he appeared on The Arsenio Hall show. They show a clip when an apparently drunken Carrey takes a feeble swipe in Arsenio Hall's direction, and calls him a "black bastard." It's disturbing. Arsenio handled the moment professionally, apologizing to the audience and quickly deciding to go to break. As said in this Consequence of Sound review, "some of this stuff makes him look mean, or like a failure of performative acting." That's understating the matter. Again, a provocateur comes to mind, an arrogant one, a selfish one, who will say or do anything to get a reaction.