The movie followed the report.
But the report didn't follow the physics.
Those guys were literally in a vacuum bottle. Vacuum bottles keep hot things hot because of the vacuum. People run hot, compared to space. Also, the walls of the LM were not insulated. You're supposed to be in a space suit when you use the thing under normal conditions. So why was it only 38 degrees inside, when it was over 200 degrees colder on the other side of the aluminum hull? Try that in Alaska during winter, see how cold it gets.
Doesn't add up either way. Should have been way colder with no people in it, or way hotter with people in it.
In addition to being in the extreme cold of space, the LM was exposed to sunlight on the trip. 38 F is quite reasonable in those conditions.